SURFACE WATER SUPPLY of HAWAII

UNITED STATES DEPARTMENT OF THE INTERIOR HAROLD L. ICKES, Secretary GEOLOGICAL SURVEY W. C. MENDENHALL, Director

Water-Supply Paper 865

SURFACE WATER SUPPLY of HAWAII

JULY 1, 1937, to JQNE 30, 1938

'«* & *p NATHAN C. GROVER, Ohigf Hjftlraulic Engineer MAX H. CARSON, Distri^ E

Prepared in cooperation 4fi TERRITORY OF'&Ali., o ^r> \ - -^ ' ^^ xO» ^«* %tix 5 ^ ^ A % ^. , -O" -\l» *A\ % * VO ^~yr >^

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UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1940

For sale by the Superintendent of Documents, Washington, D.C. - - - Price 20 cents (paper cover)

CONTENTS

Scope of work...... 1 Definition of terms...... 1 Explanation of data...... 1 Accuracy of field data and computed results...... 1 Publications...... 2 Records of discharge collected by agencies other than the Geological Survey...... 3 Cooperation...... 5 Division of work...... 5 Gaging-station records...... 6 Island of Kauai...... 6 Waimea River below Kekaha ditch intake, near Waimea...... 6 Kawaikoi Stream near Waimea...... 7 Mohihi Stream at altitude 3,500 feet, near Waimea...... 8 Kokee ditch near Waimea...... 9 Waiahulu Stream near Waimea...... 10 Kekaha ditch at camp 1, near Waimea...... 11 Hanapepe River at Koula, near Kleele...... 12 Hanapepe ditch below intake, near Kleele...... 13 Hanapepe ditch at Koula, near Eleele...... 14 South Fork of Wailua River near Lihue...... 15 North Fork of Wailua River at altitude 650 feet, near Llhue...... 16 Hanalel tunnel outlet near Lihue...... 17 North Wailua ditch near Lihue...... 18 Stable storm ditch near Lihue...... 19 Kanaha ditch near Lihue...... 20 Wailua ditch near Kapaa...... 21 East Branch of North Fork of Wailua River near Lihue...... 22 Kapaa River at Kapahi ditch intake, near Kapaa...... 23 Kapahi ditch near Kealia...... 24 Makaleha ditch near Kealia...... 25 Anahola River near Kealia...... 26 Anahola ditch above Kaneha Reservoir, near Kealia...... 27 Anahola ditch wasteway near Kealia...... 28 Lower Anahola ditch near Kealia...... 29 Ka Loko ditch near Kilauea...... 30 Puu Ka Ele ditch near Kilauea...... 31 Kalihiwai ditch near Kilauea...... 32 Hanalei River at altitude 625 feet, near Hanalei...... 33 Hanakapiai Stream near Hanalei...... 34 Hanakoa Stream near Hanalei...... 35 Kalalau Stream near Hanalei...... 36 Island of Oahu...... 37 Right Branch of North Fork of Kaukonahua Stream near Wahiawa...... 37 Left Branch of North Fork of Kaukonahua Stream near Wahiawa...... 38 Puhawai Stream at Lualualei, near Waianae...... 39 Pearl Harbor Springs at Waiawa, near Pearl City...... 40 Pearl Harbor Springs at Puukapu, near Pearl City...... 41 Pearl Harbor Springs at Loko Kukona, near Pearl City...... 42 Pearl Harbor Springs at Waiau, near Pearl City...... 43 Pearl Harbor Springs at Kalauao, near Aiea...... 44 Moanalua Stream near Honolulu...... 45 Kalihi Stream near Honolulu...... 46 Nuuanu Stream below reservoir 2 wasteway, near Honolulu...... 47 West Branch of Manoa Stream near Honolulu...... 48 East Branch of Manoa Stream near Honolulu...... 49 East Manoa ditch near Honolulu...... 50 Pukele Stream near Honolulu...... 51 Waiomao Stream above Pukele Stream, near Honolulu...... 52 Kahaluu Stream near Heeia...... 53 Waihee Stream near Heeia...... 54 Miscellaneous discharge measurements...... 55 Island of Molokai...... 56 Halawa Stream near Halawa...... 56 Waiakeakua Stream near Wailau...... 57 Pulena Stream near Wailau...... 58 PeleKunu Stream near Pelekunu...... 59 Lanipuni Stream near Pelekunu...... 60 Waikolu Stream below pipe-line crossing, near Kalaupapa...... 61 Miscellaneous discharge measurements...... 62 Island of Maul...... 63 Honokohau Stream near Honokohau...... 63 Honokawai ditch near Lahaina...... 64 Olowalu ditch near Olowalu...... :...... 65 Oheo Stream below diversion dam, near Kipahulu...... 66 Makapipi Stream near Nahiku...... 67 West Makapipi Spring near Nahiku...... 68 III IV CONTENTS

Gaging-station records Continued. Island of mui Continued. Page Hanawl Stream near Nahiku...... 69 Hanawi Stream "below Government Road, near Nahiku...... 70 Kapaula Stream near Nahiku...... 71 Kapaula Stream "below Government Road, near Nahiku...... 72 Koolau ditch at Nahiku weir, near Nahiku...... 73 Waiaaka Stream near Nahiku...... 74 Paakea Stream near Nahiku...... 75 Waiohue Stream near Nahiku...... 76 West Kopiliula Stream near Keanae...... 77 East Wailuaiki Stream near Keanae...... 78 West Wailuaiki Stream near Keanae...... 79 East Wailuanui Stream near Keanae...... 80 West Wailuanui Stream near Keanae...... 81 Taro patch feeder ditch at Keanae...... 82 Koolau ditch near Keanae...... 83 Honomanu Stream near Keanae...... 84 Haipuaena Stream near Huelo...... 85 Haipuaena diversion ditch at Kolea Gulch, near Keanae...... 86 Spreckels ditch at Haipuaena weir, near Huelo...... 87 Koolau ditch at Haipuaena, near Huelo...... 88 Puohokamoa Stream near Huelo...... 89 Manuel Luis ditch at Puohokamoa Gulch, near Huelo...... 90 Spreckels ditch at Wahinepee, near Huelo...... 91 Waikamoi Stream above Wailoa ditch, near Huelo...... 92 Alo Stream near Huelo...... 93 Kaaiea Stream near Huelo...... 94 Oopuola Stream near Huelo...... 95 Nallillihaele Stream near Huelo...... 96 Kallua Stream near Huelo...... 97 Hoolawaliilii Stream near Huelo...... 08 Hoolawanui Stream near Huelo...... 99 Honopou Stream near Huelo...... 100 Honopou Stream at Lowrie ditch siphon, near Huelo...... 101 Honopou Stream above Haiku ditch, near Huelo...... 102 Honopou Stream below Haiku ditch, near Huelo...... 103 Wailoa ditch at Honopou, near Huelo...... 104 New Hamakua ditch at Honopou, near Huelo...... 105 Old Hamakua ditch at Honopou, near Huelo...... 106 Lowrie ditch at Honopou Gulch, near Huelo...... 108 Haiku ditch at Kapalalaea Gulch, near Huelo...... 109 Island of Hawaii...... 110 Waiakea Stream at middle flume house, near ^fountain View...... 110 Wailuku River at Pukamaui, near Hilo...... Ill Wailuku River above Hilo Boarding School ditch intake, near hilo...... 112 Hilo Boarding School ditch at intake, near Hilo...... 113 Kapehu ditch near Hilo...... 114 Awini ditch at East Honokaneiki Gulch, near Niulii...... 115 East Honokaneiki intake to Awini ditch at East Honokaneiki Gulch, near Niulii.... 116 Kohala ditch at Pololu, near Niulii...... 117 Kehena ditch near Kohala...... '.... 118 Miscellaneous discharge measurements...... 119 Index...... 121 SURFACE WATER SUPPLY OF HAWAII, JULY 1, 1937, to JUNE 30, 1938

SCOPE OF WORK

This volume contains results of measurements of the flow of streams and ditches in the Territory of Hawaii during the year ending June 30, 1938. Since the beginning of stream- gaging work In Hawaii, in 1910, records of flow of streams and ditches have been obtained at about 481 stations for periods ranging from a few months to 27 years. In addition, hundreds of miscellaneous measurements have been made, and rather extensive studies of ground water have been In Kau, Hawaii,-'-and on the islands of Oahu, 2 Maul, Molokai, Lanai, and Kahoolawe. In this volume are given the records of dally flow obtained at stations that were operated during the year ending June 30, 1938, and the results of miscellaneous measure­ ments of stream flow made during that year. The results of ground-water studies will be published In bulletins of the Territorial Division of Hydrography. See "Publications", on page 3, for a record of surface water-supply papers pertaining to Hawaii.

DEFINITION OF TERMS

The units In which stream-flow data are presented in this report are defined as follows: "Second-feet" is an abbreviation for "cubic feet a second." A second-foot is the rate of discharge of water flowing in a channel having a cross-sectional area of 1 square foot and an average velocity of 1 foot a second. An "acre-foot" is equivalent to 43,560 cubic feet and is the quantity required to cover an acre to the depth of 1 foot. The term is commonly used in connection with storage for Irrigation. In the Territory of Hawaii the unit most commonly used in measuring water is the "million gallons." This Is used with two meanings (1) to indicate a rate of flow and (2) to express an actual quantity of water. In the former sense "million gallons a day" Is Inferred, 1,000,000 gallons' being taken as the unit of quantity and 24 hours as the unit of time. With this meaning the term is generally used in connection with pumping and Irrigation. In the latter sense "million gallons" as an absolute quantity is used in the measurement of storage capacities of reservoirs. The following convenient approximate relations exist between second-feet, million gallons a day, and acre-feet: 1 second-foot flowing 24 hours equals about 2 acre-feet; 1,000,000 gallons equals about 3 acre-feet or about 1.55 second-feet.

EXPLANATION OF DATA

The base data collected at gaging stations consist of records of stage, measurements of discharge, and general Information used to supplement the gage heights and discharge measurements In determining the dally discharge. All records of stage are obtained from water-stage recorders that give continuous records of the fluctuations. Measurements of 1 Stearns, H. T., and Clark, W. 0., Geology and water resources of the Kau district, Hawaii: U. S. Gfeol. Survey Water-Supply Paper 616, 1930. 2 Stearns, H. T., and Vaksvik, K. N., Geology and ground-water resources of Oahu, Hawaii: T. H. Division of Hydrography Bull. 1, 1935; Records of the drilled wells on Oahu, Hawaii: T. H. Division of Hydrography Bull. 4, 1938. Stearns, H. T., Geological map and guide of Oahu, Hawaii: T. H. Division of Hydrography Bull. 2, 1939. Stearns, N. D., Annotated bibliography and Index of geology and water supply of Oahu, Hawaii: T. H. Division of Hydrography Bull. 3, 1935. 2 PUBLICATIONS

discharge are usually made with a current meter by the general methods outlined in stand­ ard textbooks on the measurement of river discharge. Rating tables giving the discharge for any stage are prepared from the discharge measurements. The application of the daily gage heights to these rating tables gives the discharge from which the daily, monthly, and yearly discharges are determined. Occasionally discharge is determined from a weir or a rating flume, using standard formulas, and for a few stations the high-water discharge has been determined by the use of models. The data presented in this report comprise, for each gaging station, a description of the station, a table showing the daily discharge of the stream, and a table of monthly and yearly discharge and run-off. Skeleton rating tables are published except for ditch stations. All rates of flow are expressed as million gallons a day. The description of the station gives location, drainage area, records available, dis­ charge corresponding to maximum and minimum recorded stages, average discharge if there has been more than 10 years of record, and, under "Remarks", notes on accuracy of the records, diversions that decrease the flow at the gage, and artificial regulation. The table of daily discharge gives, in general, the discharge corresponding to the mean daily gage heights. But when, owing to sudden or rapid diurnal fluctuation, the discharge obtained from the rating table by applying the mean daily gage height would not be within 5 per cent of the true mean, the mean has been obtained by averaging discharges for intervals during the day or by use of the discharge integrator. In the table of monthly discharge the column headed "Maximum" gives the flow for the day when the total discharge was greatest. This does not correspond to the rate of flow at the crest of the flood. The maximum rate of flow is given in the station description under the heading "Extremes", and the corresponding stage is always taken from the water- stage recorder graph unless otherwise noted. Likewise, in the column headed "Minimum" the quantity given is the flow for the day when the total discharge was least. The columns headed "Mean" give the average flow in million gallons a day and cubic feet a second during the month. The "total run-off in million gallons" is the sum of the daily flows, and the "total run-off in acre-feet" is computed from the total monthly discharges in million gallons a day.

ACCURACY OF FIELD DATA AND COMPUTED RESULTS

The accuracy of stream-flow data depends primarily (1) on the permanency of the stage- discharge relation and (2) on the accuracy of observation of stage, measurements of flow, and interpretation of records. A general statement under "Remarks" gives the accuracy of records, the terms "excel­ lent", "good", "fair", and "poor" indicating that the record is probably accurate within 5, 10, 15, and 20 per cent, respectively. It should be borne in mind that the observations in each succeeding year may be ex­ pected to throw new light on data previously published. Computations are carried to not more than three significant figures, except that monthly and yearly total run-off (million gallons and acre-feet) above 10,000 are carried to four significant figures.

PUBLICATIONS

The following table gives by years the serial numbers of the papers on the surface- water supply of Hawaii published from 1903 to 1938, and, used in conjunction with the RECORDS OF DISCHARGE COLLECTED BY AGENCIES OTHER THAN THE GEOLOGICAL SURVEY list of stations maintained, given in Water-Supply Paper 795, provides a convenient in­ dex for finding the data for any station. The data for any particular station will be found in the reports covering the years during which that station was maintained, unless, owing to undeveloped rating curves, publication has been postponed. Occasionally data are revised and republished In later papers. Miscellaneous discharge measurements made during any year at points other than regular gaging stations are included in the data published for that year.

Numbers of water-supply papers containing data on the surface-water supply of Hawaii, 1903-38

Year Number Year Number Year Number

"T Qfl^ 1920-21 ...... 535 1930-31 ...... 725 1 QflQ "I ~] + 318 1921-22...... 555 1931-32...... 740 1 Q1 O4- 336 1932-33...... 755 1913f ...... rzr-t'T. 1923-24...... 595 1933-34...... 770 1924-25 ...... 615 1934-35...... 795 1915 16...... 1935-36 ...... 815 1 QT c -] rj 1936-37...... 835 1927-28...... 675 1937-38...... 865 -\ cn p -i Q 515 710 *Water resources of Molokai, by Waldemar Lindgren. tCalendar years; reports subsequent to Water-Supply Paper 373 cover the year beginning July 1 and ending June 30.

RECORDS OF DISCHARGE COLLECTED BY AGENCIES OTHER THAN THE GEOLOGICAL SURVEY

The following table contains a list of gaging stations in the Territory of Hawaii at which records of discharge were collected by agencies other than the Geological Survey during the fiscal year July 1937 to June 1938. The records for these stations are not contained in the publications of the Geological Survey.

Records of discharge collected by agencies other than the Geological Survey IS LAUD OF KAUAI

Stream Location Period Operated by

Anahola ditch. Lower.... Near Government Road near 1925-38 East Kauai Water Co. Anahola. East Lawai ditch...... Near Government Road near 1924-38 McBryde Sugar Co. Kalaheo. Eleele ditch...... Near Government Road near 1924-38 Do. Kalaheo . Above Kalihiwal Reservoir, 1923-38 Kllauea Sugar Plantation Co. near Kllauea. Below Intake, near 1925-38 Lihue Plantation Co. Hanamaulu. At Makawell Plantation 1926-38 Hawaiian Sugar Co. boundary near Makawell. Hanapepe Field ditch. . . . Below Hanapepe River intake, 1924-38 McBryde Sugar Co. near Eleele. At tidewater near Eleele. 1924-38 Do. Near Koloa boundary, near 1924-38 Do. Koloa. Kapaia River diversion 1928-38 Llhue Plantation Co. to field 8 reservoir. Kapaia River diversion 1927-38 Do. to field 29. 4 mile above cannery near 1924-38 McBryde Sugar Co. Kalaheo. Llhue lower ditch...... Below Intake, near Lihue... 1925-38 Lihue Plantation Co. Lihue upper ditch...... Below intake, near Lihue... 1925-38 Llhue Plantation Oo. Near Hanalei, at altitude 1934-38 McBryde Sugar Co. about 600 feet. Near Mimino Reservoir, near 1925-38 East Kaual Water Co. Kealla. Old Tunnel ditch...... Above confluence with main 1925-38 Koloa Sugar Co. Koloa ditch, near Koloa. At powerhouse near Makawell. 1926-38 Hawaiian Sugar Co. Stable storm ditch...... At Stable Camp road cross- 1931-38 Llhue Plantation Co. Ing near Lihue. Above Kalaheo-Lihue main 1926-38 Koloa Sugar Co. highway near Koloa. RECORDS OF DISCHARGE COLLECTED BY AGENCIES OTHER THAN THE GEOLOGICAL SURVEY

Records of discharge collected by agencies other than the Geological Survey Continued ISLAND OF KAUAI Continued

Stream Location Period Operated by

Kalaheo . Branch. Llhue.

about 960 feet. Near camp 12, near Kalaheo.... 1924-38 Do.

ISLAND OF OAHU 1932-38 Board of Water Supply City and County of Honolulu. In Pauao Valley, at altitude 1929-38 Do. 685 feet. About 3 miles below Tipper 1933-38 Waialua Agricultural Co. Helemano Reservoir. In Makiki Valley, at altitude 1925-38 Board of Water Supply City 970 feet. and County of Honolulu. *Kahuawai Springs ...... In Pauao Valley, at altitude 1925-38 Do. 618 feet. At diversion, at altitude 650 1926-38 Do. feet. In Kawailoa Gulch about 500 1934-38 Waialua Agricultural Co. yards above third siphon from Government Road. Waiahole Water Co. In Makiki Valley, at altitude 1926-38 Board of Water Supply City 350 feet. and County of Honolulu. *Hanoa tunnels ...... Upper Manoa Valley...... 1925-38 Do. 1926-38 Do. *Nuuanu tunnel 3...... At overflow, in upper Nuuanu 1931-38 Do. Valley. *Palolo tunnel ...... Upper Palolo Valley...... 1926-38 Do. Wahlawa Reservoir outlet About 1, 200 feet below dam. . . 1912-38 Wahiawa Water Co. 1919-38 Waiahole Water Co. 1916-38 Do. 1917-38 Do. ....do...... 1917-38 Do.

ISLAND OF MAUI (East Maul) Banana Spring...... Near east wall of Keanae 1933-38 East Maul Irrigation Co. Valley, at altitude 700 feet. Hanawl Stream,...... In low-water channel of Hanawi 1933-38 Do. Gulch near Nahiku, at alti­ tude 650 feet. Hanawl Spring, upper On east side of pali in Hanawi 1932-38 Do. high-level. Gulch near Nahiku, at alti­ tude 675 feet. Hanawl Spring, lower On east side of pali in Hanawl 1932-38 Do. high-level. Gulch near Nahiku, at alti­ tude 575 feet. Makapipi ditch. At west edge of Makapipi Gulch 1933-38 Do. near Nahiku, at altitude 1,300 feet. Oheo Spring.... In Keanae Valley, along Belt 1933-38 Do. road f mile east of Keanae P. 0., at altitude 200 feet.

ISLAND OP MftUI (West Maul) Everett ditch...... Below intake, near Wailuku. . . . 1935-38 Wailuku Sugar Co. 1933-38 County of Maul. lao-Waikapu ditch...... At lower end of tunnels near 1923-38 Wailuku Sugar Co. Wailuku. Kama ditch...... Below intake, near Wailuku.... 1933-38 Do. Maniania ditch...... 1923-38 Do. North Waiehu ditch...... Near end of Waiehu Camp road, 1922-38 Do. near Wailuku. South Waikau ditch...... Above first lateral, near 1935-38 Wailuku Sugar Co. Waikapu. Below tunnel sections near 1923-38 Do. Waikapu. Spreckels ditch...... Below Intake, near Walhee. 1931-38 Do. 1922-38 Do.

ISLAND OP HAWAII At Awlnl weir in Honokane, tl917-38 Kohala Ditch Co. near Niulii. At Niulii weir, near Nlulll. t!917-38 Do. Pololu Inlet 1...... At Pololu, near Niulii...... 1929-38 Do. Polulu Inlet 2...... 1929-38 Do. Above Kohala ditch, near 1929-38 Do. Niulii. Above Kohala ditch, near 1933-38 Do. Halawa. ....do...... 1929-38 Do. Published In Biennial Reports of Honolulu Sewer i Water Commission and of Board of Water Supply City and County of Honolulu. tReoords for some earlier years published in water-supply papers of Geological Survey. DIVISION OF WORK

Records of discharge collected by agencies other than the Geological Survey Continued ISLAKD OF HAWAII Continued

Stream Location Period Operated by

Above Kohala ditch, near 1929-38 Kohala Ditch Co. Halawa. 6.0 miles north of Wiohinu. 1927-38 Hut china on Sugar Plantation Co. Plantation Springs tunnel... 8.7 miles north of Naalehu. 1927-38 Do. In Moaula Gulch, at alti­ 1929-38 Hawaiian Agricultural Co. tude 4,650 feet, 6.5 miles from Fahala. Domestic supply tunnel 16 ... 3.8 miles from Fahala, at 1926-38 Do. altitude 2,800 feet. In Hionamoa Gulch, at alti­ 1926-38 Do. tude 3,000 feet, 3.4 miles from Fahala. 1926-38 Do. tude, 4,150 feet, 5.35 miles from Fahala. In Fiikea Gulch, at alti­ 1926-38 Do. tude 3,750 feet, 4.8 miles from Fahala. 5.3 miles from Fahala, at 1928-38 Do. altitude 3,500 feet. In Waiakaloa Quloh, at alti­ 1926-38 Do. tude 3,750 feet, 6.1 miles from Fahala. Upper Hamakua ditch and At base of Puu Lala, near $1907-12 Hawaiian Irrigation Co. Reservoir 3 weir. Honokaa. 1921-38 At main weir near Eukuihaele 11921-38 Do. 1923-38 Do. JRecords for some earlier years published in water-supply papers of Geological Survey. JRecords for 1913-20 published in water-supply papers of Geological Survey. Hote.- Records not published unless otherwise indicated.

COOPERATION

The work during the year ending June 30, 1938, was done under cooperative agreement with the Territory of Hawaii through the commissioner of public lands and the Board of Water Supply City and County or Honolulu. Assistance In collecting records was rendered also on the Island of Kaual by the Kekaha Sugar Co. Ltd., the McBryde Sugar Co. Ltd., the East Kaual Water Co. Ltd., the Kllauea Sugar Co. Ltd., and the Llhue Plantation Co. Ltd.; on the Island of Oahu by the Wahlawa Water Co. Ltd.; on the Island of Maul by the Pioneer Mill Co. Ltd., and the East Maul Irrigation Co. Ltd.; and on the Island of Hawaii by the City of Hllo Water Works, the Kohala Ditch Co. Ltd., and the Olaa Sugar Co. Ltd. Acknowledgment of records collected by Individuals or corporations is made In connec­ tion with the description of each station for which such records were furnished.

DIVISION OF WORK

The data were collected and prepared for publication under the direction of M.-H. Carson, district engineer, Honolulu, Hawaii. ISLAND OF KAUAI

Wajmea River below Kekaha ditch Intake, near Walmea Location.- Lat. 22002'40", long. 159°38'35", in Waimea Canyon, 500 feet downstream from Kekaha ditch lower Intake and 6i miles northeast of Walmea. Altitude, 490 feet, by barometer. Drainage area.- 45.0 square miles. Records available.- July 1921 to June 1938. Average discharge.- 13 years (1925-38), 42.5 million gallons a day (65.8 second-feet). Extremes.- Maximum discharge during year, 7,500 million gallons a day (11,600 second- feet) Mar. 26 (gage height, 16.95 feet), from rating curve extended above 500 million gallons a day; minimum, 0.07 million gallons a day (0.11 second-foot) Aug. 8. 1921-38: Maximum discharge, 10,700 million gallons a day (16,600 second-feet) Dec. 24, 1927 (gage height, 20.40 feet), from rating curve extended above 500 million gallons a day; no flow occasionally, owing to regulation. Remarks.- Records fair except those above 700 million gallons a day, which are poor. Kokee and Kekaha ditches divert above the station, taking practically all the water at low and medium stages for Irrigation near Walmea and Kekaha.

Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge. In million gallons a day) July 1 to Mar. 26 Mar. 27 to June 30 3.8 0.08 4.7 8.8 7.0 212 4.6 0.05 6.5 * 118 3.9 .13 5.0 17.5 8.0 460 4.8 .30 7.0 207 4.0 .30 5.5 42 9.0 820 5.0 1.8 8.0 460 4.2 1.40 6.0 79 10.0 1,300 5.5 20 9.0 820 4.4 3.55 6.5 133 11.0 1,890 6.0 58 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan-. Feb. Mar. Apr. May June

1 0.10 207 0.10 0.1 132 0.08 24 118 139 209 64 238 2 .10 362 .10 35.5 51 .10 4.1 836 63 58 154 150 3 19.6 82 .19 .97 2.2 .10 .27 452 46 79 78 45 4 150 15.7 31 1.78 .08 .10 .23 284 »25 36 38 2.7 5 210 .20 3.5 4.1 53 .10 .16 521 *15 50 9 .8 .19 6 131 .10 *3.0 .12 72 .11 .15 144 4.1 286 .25 .15 7 165 .10 »4.5 .12 64 .11 .12 63 4.9 66 .15 .15 8 13.0 .08 5.3 .12 92 .11 10.4 49 299 34 .15 .14 9 .12 .08 .85 .12 23.5 .12 .36 37 108 17.6 6 .8 .14 10 .12 .08 .10 .10 35.5 .12 .16 30 41 499 10 .3 390 11 .10 .08 .09 .10 11.6 .18 .13 51 68 365 .19 300 12 .10 .08 .24 .10 1.98 291 .12 490 168 123 35 74 13 .12 .08 .14 .10 .12 3.95 .12 395 312 45 6 .8 12.4 14 1.37 .08 .08 .10 .11 .18 .12 116 430 20 2 .15 48 15 15.2 36.5 .08 3.75 .10 .12 .12 71 278 15.2 .14 146 16 2.45 483 .09 .12 .08 .10 .12 48 109 8.7 .16 21 17 290 871 .10 .11 .10 .10 .11 37 45 2.75 .15 8.6 18 21 t67 .10 151 .09 .09 .11 30 19.5 1.04 .15 35.5 19 .12 t6.4 .10 2.6 .09 .09 .11 25.5 66 .24 .14 4.6 20 78 t-64 .10 .10 .08 .13 .11 22. E 28.5 .19 .14 5.3 81 61 .12 .10 .12 .08 1.54 .11 81 14.5 .15 51 60 32 53 .10 .10 .11 .10 .10 .31 21 7.6 .14 3 .3 .18 83 2.1 .08 .10 .13 .10 120 .11 34 11.6 .13 .22 .15 84 .13 8.2 .11 .12 .10 107 5.1 30 10.6 .12 .16 .36 35 33 2.45 .10 .12 220 286 .11 49 1.84 .12 .15 .14 26 115 .12 .10 .12 19.3 292 .10 56 861 74 96 .13 37 20 4.1 .10 .11 .34 83 52 116 511 110 9 .1 .14 28 4.2 9.5 3.5 .10 .10 91 1,160 98 128 .33 .24 .15 39 .12 13.2 1.14 345 .09 78 1,730 224 .15 .51 .16 30 .12 10.9 .11 55 .09 81 248 181 .16 .34 4.7 31 .38 .52 42 153 110 1 .40

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 290 0.10 44.7 69.2 1,390 4,260 Li:::::::::::::::::::::::::: 871 .08 70.4 109 2,180 6,690 Sep 31 .08 1.84 2.85 55.2 169 Oct 345 .10 20.7 32.0 642 1,970 HOT 220 .08 26.0 40.2 780 2,390 Dec 292 .08 47.7 73.8 1,480 4,540 C alendar year 193 1,970 .08 63.5 98.2 23,160 71,080 Jan 1,730 .10 109 169 3,390 10,400 Feb* 836 21 144 223 4,040 12,410 Mar 861 1.84 140 217 4,330 13,290 Apr 499 .12 66.7 103 2,000 6,140 May 154 .14 18.4 28.5 569 1,750 Jun 390 .13 49.8 77.1 1,490 4,580 Fiscal year 1937-38 1,730 .08 61.2 94.7 22,350 68,590

Peak discharge.- Jan. 28 (3 p.m.) 5,910 m.g.d. (9,140 sec.-ft.); Jan. 29 (10 a.m.) 5,310 m.g.d. (8,220 seci-ftT); Mar. 26 (7 p.m.) 7,500 m.g.d. (11,600 sec.-ft.). Partly estimated. tQage height missing; discharge computed on basis of records for stations on nearby streams. ISLAND OF KAUAI

Kawaikoi Stream near Waimea

Location.- Concrete control, lat. 22°08'00", long. 159°37'15", at old trail crossing, 124 miles northeast of Waimea. Altitude, 3,420 feet, by barometer. Drainage area.- 4.1 square miles. Records available.- April 1909 to June 1933. July 1917 to July 1919 (unpublished). Average discharge.- 19 years (1919-38), 22.0 million gallons a day (34.0 second-feet). Extremes.- Maximum discharge during year, 4,670 million gallons a day (7,230 second- feet) Dec. 23 (gage height, 11.20 feet), from rating curve extended above 180 million gallons a day; minimum, 3.7 million gallons a day (5.7 second-feet) Oct. 17, Dec. 8, 9. 1909-38: Maximum discharge, that of Dec. 23, 1937; minimum, 1.3 million gallons a day (2.0 second-feet) Sept. 15, 1921. Highest stage known, 15.2 feet, Dec. 18, 1916 (discharge not determined). Remarks.- Records excellent.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 2.0 2.7 2.6 14.4 4.0 141 2.2 5.1 3.0 30.5 4.5 241 2.4 8.9 3.5 70 5.1 380 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.4 179 7.8 11.4 126 4.4 16.7 22.5 53 79 36 44 2 6.0 102 8.1 13.1 40 4.2 16.0 159 13.5 20.5 61 24.5 3 48 35.5 24 S.I 15.7 4.2 10.9 56 9.2 32.5 29.5 14.7 4 174 25 35 36 12.3 4.2 8.9 31 7.6 16.0 16.0 10.4 5 178 16.0 11.7 11.2 32.5 4.1 7.8 32 6.8 119 10.6 8.3 6 76 18.6 11.6 10.0 32 3.9 7.0 16.4 6.3 143 8.9 7.2 7 85 11.4 23.5 11.4 36.5 3.8 6.8 12.6 17.0 26.5 7.8 6.6 8 20.5 9.4 32 6.5 64 3.8 46 10.6 202 18.8 20 7.8 9 16.0 11.7 11.7 11.7 32.5 17.0 12.9 9.4 41 40 53 34.5 10 13.2 10.4 8.3 6.1 31 8.3 7.4 8.5 42 228 27 236 11 9.2 10.9 9.4 4.8 15.7 5.6 6.3 8.5 36.5 151 23 67 12 13.6 26 12.9 4.4 11.4 70 5.8 51 118 43 36 22.5 13 14.7 11.4 8.3 4.6 9.4 9.6 5.4 39 152 24.5 15.8 12.0 14 9.4 13.6 6.5 4.3 8.3 6.6 5.1 12.3 202 27 17.9 85 15 8.9 100 5.8 4.1 7.6 5.3 4.8 9.4 126 21 21.5 54 16 24.5 150 6.6 3.9 7.0 4.6 4.7 8.3 44 14.7 10.4 21.5 17 148 238 8.7 5.8 6.8 4.2 4.4 7.4 24.5 12.6 8.5 45 18 16.4 25 5.8 45 6.3 4.1 4.3 7.0 46 11.4 7.4 37.5 19 19.1 16.4 5.3 8.5 6.0 3.8 4.3 6.6 37.5 10.6 6.6 36.5 20 64 12.9 4.8 6.8 6.8 4.2 4.2 6.3 22.5 9.9 7.0 21.5 21 27.5 10.9 4.6 8.7 14.4 4.8 4.1 6.0 15.7 8.9 80 15.7 22 16.7 9.4 4.4 9.6 8.3 4.2 4.1 6.0 12.3 8.1 13.2 10.9 23 12.9 9.6 4.6 10.9 6.0 199 34.5 8.9 17.8 7.6 11.4 9.2 24 34 10.9 4.7 11.4 5.6 54 19.3 9.6 12.9 7.2 7.8 8.1 25 49 8.9 4.4 16.6 28 103 6.3 17.1 9.9 7.4 22.5 7.6 26 151 21.5 10.8 6.0 10.4 68 5.4 12.8 242 98 49 6.8 27 39 37 8.7 5.0 6.5 68 13.8 32.5 85 18.6 14.7 6.3 28 18.8 34.5 9.1 4.6 5.3 70 243 21 24.5 12.0 16.0 6.1 29 12.6 26 8.3 190 4.8 46 269 36 10.6 31 12.2 30 10.6 17.0 18.2 33.5 4.6 50 32.5 59 25 24.5 12.3 31 20.5 9.6 66 24.5 30 74 18.1

Hill Ion gallons a day Second- Total run-off Month feet (mean) Million Maxljsum Minimum Mean gallons Acre -feet . Jul 178 4.4 43.3 67.0 1,340 4,120 AugiLi:::::::::::::::::::::::::: 238 8.9 39.3 60.8 1,220 3,740 Sep 35 4.4 10.9 16.9 326 999 Oct 190 3.9 18.7 28.9 580 1,780 HOT 126 4.6 20.1 31.1 602 1,850 Dec 199 3.8 28.0 43.3 867 2,660 C alendar year 193 356 3.4 29.2 45.2 10,640 32,660 Jan 269 4.1 27.5 42.5 852 2,610 Fob* 159 6.0 . 22.4 34.7 628 1,930 Mar 242 6.3 58.0 89.7 1,800 5,510 Apr 228 7.2 41.7 64.5 1,250 3,840 May 80 6.6 23.0 35.6 712 2,190 Jun 236 6.1 29.7 46.0 892 2,740 PIseal year 1937- 269 3.8 30.3 46.9 11,070 33,970 8 ISLAND OF KAUAI

Mohihi Stream at altitude 3,500 feet, near Walmea

Location.- Lat. 22°07'05", long. 159°36'15", at altitude 3,500 feet, at upper trail crossing, 3.8 miles northeast of confluence of Waiahulu and Poomau Streams, and 12 miles northeast of Waimea. Drainage area.- 1.6 square miles. Records available.- June 1920 to October 1926 and October 1936 to June 1938. April 1909 to December 1912 at site 2 miles downstream (fragmentary). Extremes.- Maximum discharge during year, 440 million gallons a day (681 second-feet) Mar. 26 (gage height, 5.10 feet), from rating curve extended above 21 million gallons a day; minimum, 0.9 million gallons a day (1.4 second-feet) July 2. 1920-26, 1936-38: Maximum discharge recorded, 520 million gallons a day (805 second-feet) Jan. 16, 1921 (gage height, 6.91 feet, present datum), from rating curve extended above 25 million gallons a day; minimum, 0.2 million gallons a day (0.3 second-foot) July 16, 1921, Sept. 14, 15, 1921, Aug. 7, 8, 1922, May 16, 1926. Remarks.- Records good except those for periods when clock was stopped, Oct. 20-31, Dec. 11-13 (computed on basis of records for nearby stations) and those above 40 million gallons a day, which are poor. No diversions.

Rating table fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 1.0 0.5 1.6 5.0 2.5 27 1.2 1.4 1.8 8.2 3.0 53 1.4 2.8 2.0 12.4 3.5 96

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. HOT. Dec. Jan. Feb. Mar. Apr. May June 1 1.0 21.5 1.9 1.7 18.5 1.2 4.3 8.0 10.0 18.2 7.8 20.5 2 .9 21.5 i.e 4.0 8.4 1.2 3.5 46 4.4 6.2 12.1 10.3 3 6.5 9.6 2 9 2.2 3.7 1.1 2.9 22 2.9 7.0 8.4 5.3 4 14.2 5.6 gU 4.0 2.6 1.1 2.2 11.6 2.2 5.0 4.9 3.0 5 17.8 3.4 3.7 3.2 4.5 1.0 1.9 14.5 1.9 4.4 3.0 2.2 6 14.7 2.8 2.5 1.7 8.0 1.0 1.7 7.6 1.8 25.5 2.4 1.9 7 16.1 2.2 4.6 2.0 11.1 1.0 1.6 4.8 2.0 7.6 2.0 1.6 8 5.1 1.9 5.8 1.5 12.8 1.0 2.2 3.7 29 5.2 1.9 1.6 9 2.4 1.9 3.0 1.8 6.8 1.5 3.0 3.1 12.5 5.4 3.5 2.2 10 2.6 9.8 51 5.6 36.5 11 1.5 1.8 1.8 1.2 4.3 1.5 1.6 2.6 11.0 33 4.3 40 12 1.5 3.2 1.9 1.1 2.9 18 1.4 21.5 16.7 14. S 7.6 10.5 13 1.6 2.6 1.8 1.1 2.3 3.5 1.4 20 25.5 7.2 4.2 4.8 14 1.6 3.0 1.5 1.0 1.9 2.1 1.3 5.7 35.5 5.8 4.8 9.6 15 1.7 10.3 1.4 1.1 1.8 1.6 1.2 4.0 27.5 5.3 3.4 16.4 16 2.1 38.5 3.2 12.2 4.2 2.6 6.0 17 22.5 67 1.5 1.2 1.8 1.3 1.2 2.7 6.8 3.5 2.0 4.3 18 4.8 9.0 1.4 18.3 1.6 1.2 1.1 2.4 5.8 3.1 1.8 6.4 19 2.6 5.0 1.2 3.1 1.5 1.2 1.0 2.2 10.0 2.7 1.6 3.9 20 9.5 3.6 1.2 1.5 1.4 1.3 1.0 1.9 6.7 2.5 1.6 3.3 21 8.5 2 .8 1.1 2.0 1.6 1.5 1.0 1.8 4.5 2.3 7.5 3.6 22 6.8 2.4 1.0 2.4 1.8 1.2 1.0 1.8 3.5 2.1 3.5 2.6 23 2.9 2.2 1.0 2.5 1.5 6.7 1.7 2.1 3.3 1.9 2.3 2.1 24 2.9 2.6 1.0 3.0 1.5 13.3 3.6 2.2 3/5 1.9 1.8 .8 25 8.6 2.1 1.0 4.0 12.2 29.5 1.5 5.1 2.7 1.9 1.8 26 8.0 2.6 1.6 2.0 4.7 29 1.2 4.3 44 11.2 11.3 .6 27 6.5 6.3 1.6 1.3 2.2 11.6 6.8 10.3 34.5 4.9 8.3 .5 28 3.9 9.9 1.8 1.1 1.6 10.9 79 7.4 9.8 2.7 2.9 .5 29 2.2 9.8 2.4 25 1.4 9.2 81 17.8 2.3 4.6 .7 30 1.8 5.4 1.5 4.0 1.3 11.3 14.1 13.2 2.3 6.2 2.7 31 1.8 2.7 10 5.9 10.1 11.5 4.0

Million gallona a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallon! Acre -feet Jul 22.5 0.9 5.93 9.18 184 564 Aug &:::::::::::::::::::::::::: 67 1.8 8.55 13.2 265 814 Bep 9.4 1.0 2.22 3.43 66.5 204 Oct 25 1.0 3.60 5.57 112 342 HOT 18.5 1.3 4.51 6.98 135 415 Dec 29.5 1.0 5.64 8.73 175 536 C alendar year 193 101 .7 6.58 10.2 2,400 7,370 Jan 81 1.0 7.69 11.9 238 732 Feba 46 1.8 8.04 12.4 225 691 Mar 44 1.8 12.3 19.0 382 1,170 Apr 51 1.9 8.37 13.0 251 771 May 12.1 1.6 4.51 6.98 140 429 Jun 40 1.5 7.04 10.9 211 648 FIsoal year 1937- 81 .9 6.53 10.1 2,380 7,320 ISLAND OF KAUAI 9

Kokee ditch near Waimea

Location.- Suppressed weir control, lat. 22°06'25", long. 159°40'45", 1,000 feet west of road and 104 miles north of Waimea. Altitude, 3,310 feet, by barometer. Records available.- September 1926 to June 1938. Average discharge.- 11 years (1927-38), 18.9 million gallons a day (29.2 second-feet). Extremes.- Maximum discharge during year, 76 million gallons a day (118 second-feet) Mar. 26 (gage height, 2.69 feet); no flow Feb. 3, 5, 13, when water was shut out of ditch. 1926-38: Maximum discharge, that of Mar. 26, 1938; no flow occasionally, when water was shut out of ditch. Remarks.- Records excellent. Kokee ditch diverts water at altitude 3,400 feet from all streams tributary to Waimea River west of Mohihi Stream for irrigation near Kekaha. Flow regulated by head gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 7.4 56 13.4 17.4 35 6.6 16.8 37.5 24.5 35 46 39 2 6.9 56 12.8 16.2 25.5 6.6 22 21 17.0 30.5 50 34.5 3 42 46 21 12.5 22 6.4 18. 2 11.7 19.5 28.5 42 22 4 48 33.5 43 35.5 17.0 6.4 14.6 22 21 29 26 15.8 5 56 22 18.2 19.7 32.5 6.1 13.2 8.1 19.5 30 19.5 13.2 6 54 23 15.4 11.7 27.5 5.8 12.1 12.4 18.2 29 17.0 11.9 7 54 17.0 29 17.8 24.5 5.8 11.7 25.5 18.2 26 15.8 11.0 a 30 14.1 36.5 10.2 27 5.6 29.5 22 52 30.5 19.8 11.5 9 21 15.8 18.4 15.2 29.5 21.5 23.5 19.5 42 33.5 41 28.5 10 18.2 14.6 13.4 10.2 27.5 13.5 13.7 17.0 37 28 37 56 11 13.4 14.6 13.4 8.1 16.7 9.4 11.7 17.0 27 30.5 27.5 45 12 15.5 2S.5 17.0 7.4 17.0 39.5 10.6 15.2 28.5 29 43 27.5 13 18.2 17.0 13.2 7.3 13.4 18.1 10.0 8.0 35 32 22 21 14 13.2 16.4 10.8 7.1 12.1 11.2 9.4 19.1 26.5 28 24.5 36 15 11.7 30 9.8 6.6 10.8 9.2 9.2 27.5 20 22 30.5 50 16 17.8 61 9.4 6.6 10.2 8.0 8.7 24.5 23 27.5 18.2 30.5 17 53 37 13.2 6.6 10.2 7.3 8.5 22 29.5 26 14.6 31 18 22.5 26 10.0 38.5 9.4 6.8 8.1 21 36 23 13.4 47 19 20.5 27.5 9.1 15.8 8.9 6.4 7.8 19.5 46 22 12.3 32 20 48 21 8.5 12.3 8.5 7.3 7.6 18.2 34.5 21 12.3 31 21 33.5 18.2 8.1 14.8 16.7 8.3 7.6 18.2 29 19.5 43 23 22 23 15. 6 6.2 14.4 11.7 6.9 7.4 17.0 24.5 18.2 21.5 17.0 23 17.0 15.8 7.5 14.6 9.1 21.5 14.0 21 27.5 17.0 18.2 14.6 24 29.5 17.0 8.1 11.9 8.3 43 30.5 23.5 24.5 17.0 13.9 13.7 25 45 14.6 8.0 21.5 26.5 53 11.7 18.5 21 15.8 19.5 12.8 26 51 23.5 11.4 10.2 16.4 56 9.4 10.7 30 51 49 12.1 27 50 44 15.5 8.1 10.2 48 13.2 19.9 32 30.5 23 11.2 28 27.5 40 11.9 7.3 8.3 27.5 56 18.3 34 22 22 11.0 29 18.2 33.5 14.4 49 7.6 18.5 54 38.5 19.5 30 14.2 30 15.8 26 18.2 41 7.1 17.0 32 29 30.5 33 19.2 31 14.8 15.8 56 10.7 37.5 35 23

Million gallons a day Second- Total run-off Month feet (mean) Million Haxlaniiii Minimum Mean gallons Acre-feet Jul 56 6.9 28.9 44.7 897 2,750 Aitgi 61 14.1 27.1 41.9 641 2,580 Sep 43 6.2 14.8 22.9 445 1,370 Oct 56 6.6 17.1 26.5 532 1,630 HOT 35 7.1 16.9 26.1 507 1,560 Dec 56 5.6 16.7 25.8 518 1,590 C alendar year 193 61 5.6 21.7 33.6 7,910 24,290 Jan 56 7.4 17.4 26.9 540 1,660 Feta 37.5 8.0 19.1 29.6 536 1,640 Mar 52 17.0 29.1 45.0 902 2,770 Apr 51 15.8 26.7 41.3 802 2,460 May 50 12.3 26.7 41.3 828 2,540 Jun 56 11.0 24.8 38.4 743 2,280 P Lscal year 1937- 61 5.6 22.2 34.3 8,090 24,830 10 ISLAND OF KAUAI

Waiahulu Stream near Waimea Location.- Crude masonry-dam control, lat. 22°04'45", long. 159°39'15", in Waimea Canyon, half a mile upstream from confluence with Koaie Stream and 8f miles north of Wainea. Altitude, 890 feet, by barometer. Drainage area.- 20.0 square miles. Records available.- February to October 1916, October 1917 to June 1918, May 1925 to June 1938.July 1918 to November 1920 at same site (fragmentary and unreliable; unpub­ lished). Average discharge.- 13 years (1925-38), 29.5 million gallons a day (45.6 second-feet). Extremes.- Maximum discharge during year, 1,420 million gallons a day (2,200 second-feet) Mar. 26 (gage height, 6.98 feet), from rating curve extended above 400 million gallons a day; minimum, 8.3 million gallons a day (12.8 second-feet) Jan. 23. 1916, 1917-18, 1925-38: Maximum discharge, 2,550 million gallons a day (3,950 second-feet) Dec. 24, 1927 (gage height, 9.92 feet), from rating curve extended above 400 million gallons a day; minimum, 5.2 million gallons a day (8.0 second-feet) Nov. 4, 1927. Remarks.- Records good except those for period of missing gage heights, Mar. 3-15, which were computed on basis of records for stations on nearby streams and are fair. Kojcee ditch diverts water above station for irrigation near Kekaha.

Rating tables, fiscal year 1937-38 (gage height, in feet, nd discharge, in million gallons a day) July 1 to Mar. 26 Mar. 27 to June 30 0.9 2.0 75 0.9 9.7 2.0 85 1.0 9.5 2.5 137 1.0 12.7 2.5 148 1.2 17.0 3.0 221 1.2 21.5 3.0 232 1.4 27 3.5 327 33 4.0 455 1.6 40 4.0 454 48 5.0 750

Discharge, in million gallons, fiscal year July 1937 to June 193S

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 1 11.5 195 13.7 12.2 124 10.5 23.5 59 125 142 19.2 48 2 11.2 119 12.9 13.3 33.5 10.2 12.2 398 50 34.5 54 30 3 19.3 24 13.3 13.3 15.8 10.2 11.5 244 15 31.5 26 20 4 156 16.2 26 13. S 13.7 10.2 10.5 124 14 23 18.6 15.5 5 195 14.1 16.2 15.4 12.9 9.8 10.2 155 13 28.5 15.5 14.3 6 80 12.6 14.1 12.2 18.3 9.8 9.8 84 12 257 14.3 12.7 7 82 12.2 14.5 12.2 23 9.5 9.S 33.5 17 54 13.9 12.4 8 18.3 11.9 17.5 11.9 50 9.5 36 26.5 200 30.5 13.1 12.1 9 12.9 11.5 15.0 11.9 18.5 12.6 13.5 24 45 28 28 14.0 10 11.9 11.5 13.3 11.9 18.5 11.2 10.5 22 40 311 23 245 11 11.2 11.5 12.6 11.2 15.0 12.5 9.8 22.5 35 223 16.3 149 12 11.2 11.9 12.6 11.2 12.9 118 9.5 144 120 87 25 37.5 13 11.2 12.9 12.6 10.9 12.2 19.6 9~.2 201 ISO 35 16.7 17.7 14 11.2 12.2 12.2 10.9 11.5 13.7 9»2 61 250 21 16.7 66 15 11.2 57 11.9 10.9 11.2 11.9 9)2 31 150 20.5 15.1 77 16 11.5 249 11.9 11.2 11.2 11.2 8.9 25.5 87 18.6 13.9 18.6 17 164 334 11.9 13.3 11.2 10.9 S.9 22.5 43 17.7 13.1 22 18 19.6 50 11.9 64 10.9 10.5 8.9 21 26.5 17.7 12.7 32 19 12.9 18.0 11.5 17.9 10.9 10.9 S.6 20 4S 15.9 12.1 21 20 41 15.0 11.5 14.1 10.9 12.2 8.6 19.0 22.5 15.5 11.8 1S.1 21 17.2 14.1 11.5 15.0 10.9 12.2 8.6 18.5 19.5 15.1 61 14.7 22 18:6 12.9 12.. 2 12.9 11.2 11.5 8.6 18.5 17.5 14.7 16.3 13.9 23 13.3 12.6 11.9 12.2 10.9 126 17.2 23.5 17.0 14.3 12.7 12.7 24 13.9 12.6 11.5 12.2 10.9 68 21 21.5 17.0 14.3 12.1 12.4 25 24.5 12.6 11.5 12.2 22.5 141 9.5 25.5 17.0 13.9 12.1 12.4 26 122 12.6 11.9 12.2 15.8 95 8.9 38.5 242 86 34.5 12.4 87 28 15.8 12.9 11.5 12.2 53 8.9 72 293 23.5 17.7 12.4 28 15.4 20 12.6 11.2 11.2 67 «308 63 76 15.9 15*9 12.4 29 12.6 21 12 .9 221 10.9 61 #463 111 14.7 14^3 12.4 30 11.5 19.0 12^2 29 10.5 67 *117 109 14.7 19.6 13.1 31 11.5 14.5 45 37 #7S 79 15.9

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum iHnlnmm Mean gallons Acre-feet Jul 195 11.2 38.4 59.4 1,190 3,660 Aug 334 11.5 44.1 68.2 1,370 4,200 Sep 26 11.5 13.3 20.6 398 1,220 Oct 221 10.9 22,5 34.8 698 2,140 NOT 124 10.5 19.1 29.6 573 1,760 Dec 141 9.5 34.6 53.5 1,070 3,290 C alendar year 193 660 9.5 40.5 62.7 14,770 45,330 Jan 463 8.6 41.5 64.2 1,290 3,950 Feb 398 18.5 72.1 112 2,020 6,190 Mar 293 12 SO. 4 124 2,490 7,640 Apr 311 13.9 54.6 84.5 1,640 5,030 May 61 11.8 19.6 30.3 609 1,870 Jun 245 12.1 33.7 52.1 1,010 3,100 FIscal year 1937- 463 8.6 39.3 60.8 14,360 44,050

Peak discharge.- Aug. 17 (8 a.m.) 1,310 m.g.d. (2,030 sec.-ft.)s Dec. 23 (6 p.m.) 1,120 m.g.d. (l.VSO sec.-ft")5 Mar. 26 (8 p.m.) 1,420 m.g.d. (2,200 sec.-ft.). ISLAND OF KAUAI 11

Kekaha ditch at camp 1, near Waimea

Location.- Lat. 22°02'35", long. 159°38'30", in Wairaea Canyon, a quarter of a mile downstream from lower Intake and 6i miles northeast of Waimea. Altitude, 520 feet, by barometer. Records available.- November 1907 to June 1938. Average discharge.- 19 years (1918-24, 1925-38), 37.5 million gallons a day (58.0 second- reet). Extremes.- Maximum discharge during year, 69 million gallons a day (107 second-feet) July 25 (gage height, 4.27 feet); minimum, 0.1 million gallons a day (0.2 second- 1907-38: Maximum discharge, 71 million gallons a day (110 second-feet) Apr. 25, 1928 (gage height, 4.33 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records good. Ditch diverts water from Waiahulu Stream and Koaie River, 3 miles above lower intake, for hydroelectric plant. Lower intake is on Waimea River 300 feet downstream from power house and 1 mile downstream from confluence with Waialae River. Flow regulated by head gates. Water used for irrigation in vicinity of Kekaha.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 33 51 41 41 53 33 34 30 34 51 51 53 2 32 51 38 48 51 32 36 29 33 51 51 53 3 44 53 41 46 48 32 36 23.5 32 51 51 53 4 51 53 51 48 43 32 36 .1 32 51 48 51 5 53 51 48 48 51 31 34 .1 48 51 48 43 6 53 51 43 38 48 31 33 16.4 51 53 43 39 7 53 46 51 43 48 31 33 30 48 51 41 37 8 51 41 51 37 48 31 36 30 48 51 39 36 9 48 41 48 38 48 37 37 30 51 53 48 36 10 46 41 39 37 48 34 34 30 51 53 51 51 11 39 39 38 33 48 36 32 30 51 53 48 48 12 41 51 41 32 46 51 31 26.5 51 51 51 51 13 48 48 43 32 41 46 30 29.5 51 51 48 48 14 46 46 37 31 38 43 30 31 48 51 48 51 15 53 48 34 40 37 37 29 31 48 51 41 51 16 53 51 34 41 37 33 29 31 51 51 38 51 17 51 39 34 38 41 32 29 31 51 51 36 48 18 I 51 39 33 48 38 31 28 31 53 51 34 51 19 48 38 38 51 36 30 28 31 51 48 33 48 20 51 37 38 48 34 36 28 31 53 46 33 48 21 53 39 38 46 34 37.5 28 31 51 43 51 48 22 53 38 38 39 34 32 28 30 51 41 46 43 23 51 39 33 36 33 32 28 31 51 39 38 39 24 51 39 43 36 34 37 43 31 51 39 34 37 25 51 38 39 39 48 37 31 31 48. 39 37 36 26 51 46 39 36 51 39 30 31 36.6 48 51 34 27 51 51 37 33 43 38 39.5 31 45 51 48 34 28 51 53 39 32 38 37 33 32 48 46 43 36 29 43 53 46 46 36 37 22 48 43 51 39 30 41 48 37 51 34 36 28 48 41 51 51 31 46 46 53 36 29 51 51

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 53 32 48.0 74.3 1,490 4,560 Aug 53 37 45.3 70.1 1,400 4,310 Sep 51 32 39.5 61.1 1,190 3,640 Oct 53 31 40.8 63.1 1,260 3,880 Nov 53 33 42.2 65.3 1,270 3,890 Dec 51 30 35.4 54.8 1,100 3,370 C alendar year 193 53 20.5 40.4 68.5 14,740 45,280 Jan 43 22 31.7 49.0 982 3,020 Feb 32 .1 27.5 42.5 770 2,360 Mar 53 32 47.2 73.0 1,460 4,490 Apr 53 39 48.3 74.7 1,450 4,450 May 51 33 44.6 69.0 1,380 4,240 Jun 53 34 44.8 69.3 1,340 4,120 P Iscal year 1937- 53 .1 41.4 64.1 15,090 46,330 12 ISLAND OF KAUAI

Hanapepe River at Koula, near Eleele

Location.- Lat. 21°57'20", long. 159°33'15", just downstream from confluence with HanuaEi Stream and 4 miles northeast of Eleele. Altitude, 150 feet, by barometer. Drainage area.- 18.8 square miles. Records available.- May 1917 to January 1921 and December 1926 to June 1938. August 1910 to December 1916, at site half a mile upstream; records equivalent. Average discharge.- 14 years (1917-20, 1927-38), 56.6 million gallons a day (87.6 second-feet). Extremes.- Maximum discharge during year. 3,260 million gallons a day (5,040 second- feet) June 11 (gage height, 6.43 feet), from rating curve extended above 2,400 million gallons a day; minimum discharge recorded, 9.6 million gallons a day (14.9 second-feet) May 20. 1910-21, 1926-38: Maximum discharge, 5,550 million gallons a day (8,590 second- feet) Mar. 19, 1937 (gage height, 8.59 feet), from rating curve extended above 2,400 million gallons a day; minimum, 7.5 million gallons a day (11.6 second-feet) Dec. 15, 16, 1926. Remarks.- Records fair except those for periods when intake was plugged or clock stopped, Nov. 11-23, Dec. 29 to Jan. 30, Apr. 14-30, May 15-24, June 4-9, 13-18, 22, 24-28, which were computed on basis of records for station on East Branch of North Fork of Wailua River and are poor. Hanapepe ditch diverts water from river 3 miles above station for irrigation in vicinity of Makaweli. Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) July 1 to Nov. 25 Nov. 26 to June 30 1.0 64 2.0 238 3.2 10.2 1.3 1.2 87 2.3 325 3.5 25.5 1.6 148 1.4 114 2.6 430 4.0 1,170 41 2.0 238 1.7 168 2.9 560 60 2.5 395

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June

1 31.5 104 24 33 199 15.8 35 100 17.9 141 54 400 2 16 725 21.5 143 110 15.3 32 550 14.3 33.5 139 341 3 32.5 429 25 41 45 15.8 27 245 13.9 78 128 164 4 127 139 54 45 88 16.3 23 300 13.5 28.5 163 40 5 93 78 26 25.5 147 16.3 21 194 12.7 22.5 41 30 6 154 72 43 28 140 16.3 20 97 15.3 26.5 27.5 27 7 157 46 42 25 112 15.8 19 75 65 16.3 27.5 25 8 56 40 26 20.5 90 15.8 36 64 232 16.3 20 24 9 52 36 21.5 21 64 17.4 25 70 48 73 20.5 27 10 35.5 30 20 17.2 86 15.3 21 56 20 216 18.9 280 11 38 33.5 19.0 17.2 50 19.0 19 224 17.4 182 15.3 365 12 37 34 45 16.8 35 128 17 409 85 52 33.5 138 13 25 28 22.5 17.6 28 24.5 16 253 182 69 89 50 14 29 46 19.5 19.0 25 15.8 16 SB 180 50 29.5 40 15 33.5 64 1S.O 184 23 13.5 15 96 100 40 25 45 16 114 410 20.5 36.5 20 13.1 14 72 45 35 22 35 17 413 902 20.5 32 19 12.7 14 62 27.5 31 20 38 18 71 105 16.4 300 18 12.2 13 57 97 30 19 32 19 42 59 16.4 45 17 12.2 13 49 43 50 18 27 20 99 45 15.6 28 17 34 19 40 60 35 30 28 21 111 36.5 15.6 24 17 21 15 26 37 30 100 25 22 142 31 18.2 20.5 16 15.8 13 23 24.5 27 24 22 23 77 46 27.5 19.0 30 18.9 25 33.5 36 25 21 22.5 24 45 32 45 18.5 137 25 18 23.5 21 23 19 19 25 83 32 58 19.5 470 210 16 20.5 21 21 42 18 26 69 37 32.5 17.6 82 544 20 18.9 302 35 155 17 27 38 30.5 21.5 16.8 34 164 110 28.5 139 25 22.5 17 28 34 38 73 16.8 22.5 58 400 18.9 44 23 36.5 19 29 63 51 35 296 19.4 50 500 50 21 40 35 30 83 31 33 126 16.3 45 250 44 24 27 25.5 31 36.5 28 97 40 139 53 69

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 413 16.0 78.6 122 2,440 7,480 Auff 902 28 123 190 3,810 11,700 Sep 73 15.6 29.2 45.2 876 2,690 Dot 300 16.8 57.0 88.2 1,770 5,420 HOT 470 16 72.6 112 2,180 6,680 Dec 544 12.2 52.8 81.7 1,640 5,020 C alendar year 193 7 ...... 1,500 12.2 88.4 137 32,270 98,960 Jan 500 13 62.0 95.9 1,920 5,900 Feb 550 18.9 118 183 3,290 10,110 Mar 302 12.7 66.8 103 2,070 6,360 Apr 216 16.3 49.3 76.3 1,480 4,540 May 163 15.3 48.3 74.7 1,500 4,590 Jun 400 17 79.2 123 2,380 7,290

Placal year 1937- 58 902 12.2 69.4 107 25,360 77,780

Peak discharge.- Oct. 18 (2:15 a.m.) 2.870 m.g.d. (4,440 sec--ft.)s Mar. 26 (7:45 p.m.) 3,170 jn.g.d. (4,900 sec.-ft.)5 June 11 (7 p.m.) 3,260 m.g.d. (5,040 sec.-ft.). ISLAND OF KAUAI 13

Hanapepe ditch below intake, near Eleele

Location.- Lat. 21°58'55", long. 159°32'05", 1 mile downstream from Intake and 7 miles northeast of Eleele. Altitude, 500 feet, by barometer. Records available.- March 1930 to June 1938. Extremes.- Maximum discharge during year, 33 million gallons a day (51 second-feet) Aug. 2, 16, 17 (gage height, 3.68 feet); no flow occasionally, when water was turned out of ditch. 1930-38: Maximum discharge, 41 million gallons a day (63 second-feet) Nov. 12, 1931 (gage height, 3.96 feet); no flow occasionally, owing to closing of head gates. Remarks.- Records good except those for periods of faulty or missing gage heights, Dec. 2-16, Jan. 27-30, May 1, 2, June 17, 18, which were computed on basis of records for station on Hanapepe ditch at Koula and are fair. Ditch diverts water from Hanapepe River for irrigation in vicinity of Makaweli.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 27 32 27 32 32 29 29 22 27 30 30 32 2 27 33 30 32 31 28 29 9.2 26 30 30 32 3 31 32 32 32 30 28 27 0 25 30 30 32 4 32 32 32 32 30 28 27 0 24 30 30 32 5 32 32 32 32 30 28 26 0 24 30 30 32 6 32 32 32 32 30 28 26 0 25 30 30 32 7 32 32 32 32 30 28 26 0 25 29 32 32 8 31 32 32 32 30 28 29 0 27 30 30 32 9 32 32 32 30 30 28 27 0 29 30 30 32 10 27 32 32 30 30 28 26 0 29 32 32 32 11 21 32 32 30 30 29 26 4.3 29 30 30 30 12 32 32 32 30 29 29 26 7.3 29 30 32 29 13 30 32 32 29 30 28 26 2.0 27 30 29 30 14 26 32 32 30 30 29 26 0 26 30 31 32 15 30 32 30 32 30 29 25 0 27 30 30 30 16 31 33 32 32 30 28 26 0 30 30 30 32 17 32 32 32 32 30 27 24 0 29 29 30 32 18 32 32 32 32 29 27 25 0 30 29 30 32 19 32 33 30 32 29 27 25 0 30 28 29 32 20 32 32 29 32 29 30 24 7.6 30 29 29 32 21 30 32 29 30 29 29 24 22 30 29 30 32 22 32 32 30 30 29 29 25 24 29 29 29 32 25 29 32 32 29 29 30 25 25 30 29 27 32 24 32 30 32 29 30 30 25 24 29 26 29 32 25 32 32 32 29 32 7.2 25 25 30 27 30 32 26 32 30 32 29 30 17.0 27 25 30 27 32 32 27 32 30 32 27 29 30 31 24 30 29 32 32 28 32 30 32 27 30 30 31 25 29 27 32 32 29 32 32 32 32 30 30 15 30 29 32 30 30 32 30 32 30 30 30 6 30 29 32 30 31 32 29 32 30 22 30 32

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 32 21 30.6 47.3 94S 2,910 Augi 33 29 31.7 49.0 982 3,010 Sep 32 27 31.4 48.6 941 2,890 Oet 32 27 30-7 47.5 951 2,920 Hov 32 29 29.9 46.3 897 2,750 Dec 30 7.2 27.6 42.7 856 2,630 C alendar year 193 34 0 29.6 45.8 10,790 33,120 Jan 31 6 25.2 39.0 781 2,400 Fob 25 0 8.80 13.6 246 756 Mar 30 24 28.2 43.6 875 2,690 Apr 32 26 29.2 45.2 877 2,690 May 32 27 30.4 47.0 941 2,890 Jun 32 29 31.6 48-9 947 2,910 P iBcal year 1937- 33 0 28.1 43.5 10,240 31,450 14 ISLAND OF KWJAI

Hanapepe ditch at Koula, near Eleele

Location.- Lat. 21°57'10", long. 159°33'00", at first flume downstream from siphon at Koula, 3 miles downstream from intake and 4 miles north of Eleele. Altitude, 490 feet, by barometer. Records available.- January 1910 to June 1921, March 1927 to June 1938. Average discharge.- 21 years (1910-20, 1927-38), 25.7 million gallons a day (39.8 second-feet). Extremes.- Maximum discharge during year. 35.5 million gallons a day (54.9 second- feet) Mar. 26 (gage height, 3.08 feet); no flow occasionally, when head gates were closed. 1910-21, 1927-38: Maximum discharge, 38.5 million gallons a day (59.6 second- feet) Mar. 19, 1937 (gage height, 3.18 feet); ditch dry occasionally, owing to clos­ ing of head gates. Remarks.- Records excellent except those for period of faulty gage heights, May 11 to June 17, which were computed on basis of records for station on Hanapepe ditch at intake and are fair. Diverts water from Hanapepe River 3 miles above station for irrigation in vicinity of Makaweli. Flow regulated by head gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June 1 8.5 28 26 28 28 30 0 S.7 28 30 30 32 2 22.5 30 28 28 28 28 15.9 6.2 26 30 29.5 32 3 26 30 28 28 28 28 24 0 26 30 28 33 4 28 30 28 28 30 28 24 .2 24 30 30 33 5 24.5 30 28 28 30 26 24 0 24 30 *30 33 6 28 30 28 28 28 26 24 0 24 30 *30 33 7 28 28 28 26 28 26 24 0 24 28 *30 33 8 26 30 28 26 30 26 26 0 29 28 *30 33 9 28 30 28 26 30 26 24 1.3 26.5 30 *30 33 10 22.5 28 26 26 30 26 24 3.5 30 33 *30 33 11 17.8 28 26 26 14.7 28 24 6.2 30 30 *30 32 12 26 28 28 24 26 28 24 13.9 30 28 30 30 13 26 28 26 26 26 25.5 22.5 12.8 28 30 30 30 14 23.5 28 26 26 11.6 28 22.5 9.4 30.5 28 30 32 15 26 28 26 28 26 28 22.5 2-6 26 30 30 31 16 28 30 28 28 26 26 22.5 0 30 28 30 33 17 30 33 26 28 6.8 24 22.5 0 30 28 30 33 18 30 33 28 30 0 . 24 22.5 2.8 30 28 30 *33 19 28 33 26 30 0 24 22.5 5.2 30 27.5 30 33 20 30 30 26 28 0 26 22.5 10.8 33 30 30 33 21 27.5 30 26 28 10.7 28 22.5 21 30 27.5 29 28.5 22 30 28 26 28 22.5 28 22.5 24 30 26 28 30 23 25.5 30 28 26 24 28 22.5 26 30 21.5 29 33 24 28 28 28 26 28 28 22.5 24 30 24.5 30 33 25 30 28 28 26 28 12.6 24 26 30 26 32 33 26 28 28 23 24 30 7.9 26 24 30 27.5 32 30 27 28 28 26 24 30 28 30 24.5 28 28 32 30 28 28 28 28 23.5 30 28 30 26 30 28 32 33 29 28 28 28 30 30 30 7.5 30 28 32 30 30 28 28 28 28 30 6.2 4.0 30 28 32 33 31 28 26 28 2.6 11.8 30 32

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 30 8.5 26.3 40.7 816 2,510 Augi 33 26 29.1 45.0 903 2,770 Sep 28 23 27.0 41.8 811 2,490 Oct 30 23.5 27.0 41.8 838 2,570 HOT 30 0 23.0 35.6 690 2,120 Dec 30 2.6 24.5 37.9 759 2,330 C alendar year 193 33 0 25.0 38.7 9,130 28,030 Jan 30 0 21.3 33.0 661 2,030 Peb 26 0 9.97 15.4 279 857 Mar 33 24 28.7 44.4 889 2,730 Apr 33 21.5 28.4 43.9 S52 2,610 May 32 28 30.2 46.7 938 2,880 Jun 33 2S.5 32.0 49.5 962 2,950 F Iscal year 1937- 33 0 25.7 39. S 9,400 28,850

^Partly estimated. ISLAND OF KAUAI 15

South Fork of Wallua River near Lihue Location.- Lat. 22°02'10", long. 159°22'55", a third of a mile upstream from Wallua Falls and 5 miles north of Lihue. Altitude, 230 feet, by barometer. Drainage area.- 22.4 square miles. Records available.- December 1911 to June 1938. December 1911 to November 1918, at site a third of a mile upstream. Average discharge.- 16 years (1921-24, 1925-38), 70.9 million gallons a day (110 second-feet). Extremes.- Maximum discharge during year. 8,420 million gallons a day (13,000 second- feet) Nov. 25 (gage height, 7.46 feet), from rating curve extended above 9,000 mil­ lion gallons a day; minimum, 2.2 million gallons.a day (3.4 second-feet) Sept. 22. 1911-38: Maximum discharge, 29,000 million gallons a day (44,900 second-feet) Jan. 16, 1920 (gage height, 11.25 feet), from rating curve extended above 9,000 million gallons a day; minimum, 1.2 million gallons a day (1.9 second-feet) May 3, 1926. Remarks.- Records good. Lihue and Hanamaula ditches divert water above station, at altitudes of 600 and 500 feet, respectively, for Irrigation In vicinity of Lihue.

Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons e. day) July 1 to Nov. 25 Hov- 26 to June 30 0.7 1.6 1.7 21.5 3.1 245 0.9 3 -2 1.5 16.1 2.6 120 .9 2.8 1.9 34 3.5 400 1.0 4.4 1.8 30 3.0 215 1.1 5.0 2.1 4.0 665 1.2 7.8 2.2 61 3.5 400 1.3 8.4 2.4 4.5 1,010 1.5 13.5 Z.I 5.0 1,5SO Hot e.- Same as preceding table above 3.5 feet.

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 3.9 89 34 8.8 326 38 59 167 14.6 271 6.7 381 2 3.9 *360 5.2 68 197 37.5 45 1,230 6.7 80 83 234 3 4.2 *371 3.8 20.5 23 34.5 34 421 6.3 116 125 122 4 5.3 *120 12.4 32.5 80 13.5 28.5 298 5.8 56 226 87 5 15.7 ::-70 10.5 10.4 165 26.5 10.4 288 6.6 27.5 86 52 6 56 22 4.6 156 7.2 10.1 140 5.6 61 51 25 7 99 43 34.5 4.3 142 4.3 13.2 138 359 23.5 42 7.2 8 20.5 53 7.6 4.4 88 3.7 13.9 111 774 10.5 35.5 5.4 9 157 21.5 4.3 3.9 70 3.6 32.5 111 138 83 30.5 7.0 10 62 6.9 3.4 3.4 91 3.4 22.5 94 61 429 20.5 300 11 5G 6.2 3.4 3.2 73 4.0 12.8 246 48 338 8.5 382 12 30 42 18.8 3.2 52 34.5 7.0 635 152 99 10.7 289 13 6.0 54 11.1 3.3 46 5.1 5.6 357 214 156 101 66 14 4.2 8.9 4.3 3.4 42 4.3 5.3 140 252 68 33.5 35.5 15 4.2 6.9 3.1 76 36.5 4-4 5.6 120 181 78 13.6 89 16 28 249 3.0 5.2 31 4.6 5.3 102 99 55 19.7 41 17 269 1,230 3.5 3.4 32.5 4.3 5.3 91 64 55 6.1 50 18 72 102 3.0 415 25 4.0 5.0 78 208 37 5.2 63 19 35 38.5 2.5 82 18.4 3.8 5.2 71 111 93 4.8 53 20 53 27.5 2.5 53 14 4.0 5.4 65 112 61 5.2 30.5 21 34.5 27.5 2.4 40 23.5 4.4 6.9 60 80 32.5 5.3 25 22 97 39.5 2.3 27 7.3 4.0 5.3 58 61 23 5.4 11.6 23 41 29.5 2.8 24 3.5 13.6 5.1 45 66 30.5 4.8 22 24 22 24.5 4.5 25.5 39 45 5.0 40 46 34 4.8 7.8 25 91 8.2 18.6 35.5 1,340 240 4.6 35 39 11.2 5.3 6.5 26 83 7.4 19.0 16.0 154 629 4.7 32 460 17-. 0 158 5.9 27 29 6.7 12.8 16.3 72 271 54 35.5 304 8.3 12.4 5.4 28 21 17.7 139 12.6 56 114 563 30.5 100 6.3 5.8 5.3 29 65 239 12.6 264 49 71 828 51 5.8 17.9 5.8 30 72 75 6.5 238 42 69 180 35.5 6.7 21 6.8 31 28 40 173 96 163 110 53

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 269 3.9 50.6 78.3 1,570 4,810 Aug 1,230 6.2 113 175 3,490 10, 720 Sep 139 2.3 13.8 21.4 413 1,270 Oct 415 3.2 54.2 83.9 1,680 5,160 HOT 1,340 3.5 117 181 3,500 10,730 Doc 629 3.4 58.1 89.9 1,800 5,530 0 alendar year 193 2,860 2.3 110 170 40,310 123,700 Jan 828 4.6 69.4 107 2,150 6,600 Feb 1,230 30.5 187 289 5,240 16,080 Mar 774 5.6 135 209 4,170 12,800 Apr 429 5.8 79.1 122 2,370 7,280 May 226 4.8 39.0 60.3 1,210 3,710 Jun 382 5.3 80.7 125 2,420 7,430 F Lscal year 1937- 1,340 2 .3 82.2 127 30,010 92,120

Peak discharge.- AUK. 17 (9:30 a.m.) 5,29O m.p;.d. ffl 180 sec. -ft.); Oct. 18 (4:45 a.m ) 5,320 .g.d. (8,230 seo.-ft.); ^Partly estimated. 16 ISLAND OF KAUAI

North Fork of Wailua River at altitude 650 feet, near Lihue Location.- Lat. 22°03'50", long. 159°26'20", li miles upstream from intake of Kanaha ditch and 7-J miles northwest of Lihue. Altitude, 650 feet, from topographic map. Drainage area.- 6.6 square miles. Records available.- August 1910 to June 1938. December 1910 to September 1914, at site 300 feet downstream from confluen6e of main and east branches; records not equivalent. Average discharge.- 17 years (1921-38), 52.6 million gallons a day (81.4 second-feet). Extremes.- Maximum discharge during year. 2,370 million gallons a day (3,670 second- feet) Jan. 23 (gage height, 6.74 feet), from rating curve extended above 600 million gallons a day and slope measurement of 2,250 million gallons a day; minimum, 4.9 million gallons a day (7.6 second-feet) Jan. 23. 1910-38: Maximum discharge, 3,720 million gallons a day (5,760 second-feet) Mar. 19, 1937 (gage height, 8.67 feet); minimum not determined owing to water surface going below intake; minimum daily discharge, 1.6 million gallons a day (2.5 second- feet), estimated, May 23-25, 28, 1936. Remarks.- Records good except those for period when clock was not running, Mar. 12-22, which was computed on basis of records for stations on nearby streams and are fair. Since 1925 Hanalei tunnel has discharged its water into river, and North Wailua and Stable storm ditches have diverted water above station for irrigation In vicinity of Lihue. Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) July 1 to Jan. 2S Jan. 29 to June 30 -0.6 3.8 0.7 48 2.5 302 -0.4 5.1 0.4 38 2.5 300 -.4 7.2 .9 61 3.0 436 -.2 8.8 1.0 64 3.0 435 -.2 11.8 1.2 89 3.5 594 0 13.7 1.5 117 +.1 21 1.6 139 24 2.0 195 .4 33 2.0 198

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 9.9 84 40 49 192 36 57 102 27 123 60 237 2 10.1 197 39.5 132 116 35 48 288 25 64 88 193 3 16.3 180 44 54 69 33 43 134 24 68 91 112 4 39.5 100 68 75 78 32.5 39.5 114 13.5 52 129 73 5 18.6 76 45 48 97 31.5 37 83 6.7 87 6S 56 6 58 92 52 51 107 31 35 60 7.8 116 49 46 7 95 58 58 43 89 30 34.5 85 92 38 49 43 8 51 56 45 58 68 29 41 56 270 56 52 38 9 100 51 38.5 46 62 29.5 33 62 77 8S 64 47 10 76 42 37 38 62 28 31 58 56 340 58 208 11 75 44 37.5 37 52 26-5 30 155 52 177 40 177 12 61 40 73 37 46 37 . 29 291 100 105 52 108 13 46 25 37-5 35 41 10.8 29 126 110 124 74 60 14 46 35 30 43 39 10.4 28 78 156 88 43 60 15 43 52 33 130 37.5 10.8 27.5 64 128 73 35.5 72 16 79 182 44 45 37 10.6 27 52 87 56 32 56 17 165 472 36 41 35 10.4 26.5 46 65 49 29.5 60 18 79 96 26.5 137 34 10.1 26.5 43 78 40 28 52 19 54 65 17.9 43 32.5 10.1 27 40 63 56 25 43 20 94 52 16.7 41 35 11.3 13.2 38 66 46 15.1 46 21 86 46 16.7 38 36 10.8 5.2 35.5 57 40 48 40 22 84 45 21.5 38 31 10.6 5.1 33 48 35.5 15.8 52 23 72 51 26 43 34 ei 17.3 38 51 33 13.7 44.5 24 51 43 30.5 56 164 48 9.4 32 38 33 12 .7 33 25 94 46 48 46 447 94 5.2 30 75 31.5 32.5 31.5 26 92 46 25 36 84 247 11.2 28 299 52 114 29.5 27 69 45 47 35 58 111 33.5 142 32 33 29 28 58 75 188 42 49 106 27.5 78 31 32.5 29 29 108 108 69 197 44 93 64 31 46 38.5 30 92 54 66 113 37.5 80 109 72 44 43 38 31 58 48 166 78 110 130 56

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 165 9.9 67.3 104 2,090 6,400 Aug 472 25 84.1 130 2,610 8,000 Sep 188 16.7 45.2 69.9 1,360 4,160 Oot 197 35 64.3 99.5 1,990 6,120 HOT 447 31 77.1 119 2,310 7,100 Dec 247 10.1 45.9 71.0 1,420 4,370 C alendar year 193 1,030 8.5 80.7 125 29,450 90,370 Jan 320 5.1 53.7 83.1 1,670 5,110 Feb 291 27.5 79.7 123 2,230 6,850 Mar 299 6.7 82.6 128 2,560 7,860 Apr 340 31 73.6 114 2,210 6,780 May 129 12.7 49.3 76.3 1,530 4,690 Jun 237 29 71.7 111 2,150 6,600 Fiaeal year 1937- 472 5.1 66.1 102 24,130 74,040 ISLAND OF KAUAI 17

Hanalei tunnel outlet near Lihue

Location.- Weir control, lat. 22°05'10", long. 159°28'15", at end of Hanalei tunnel, 2i miles dovmstream from intake on Kaapoko Stream, and 9i miles northwest of Lihue. Altitude, 1,210 feet, by Lihue Plantation levels. Records available.- July 1932 to June 1938. Extremes.- Maximum discharge during year, 68 million gallons a day (105 second-feet) Dec. 23 (gage height, 1.67 feet); no flow at times, when water was shut out of ditch. 1932-38: Maximum discharge, 78 million gallons a day (121 second-feet) Mar. 19, 1937 (gage height, 1.83 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records good. Tunnel diverts water from Kaapoko Stream and Hanalei River and empties it into north branch of North Fork of Wailua River, from which it is later diverted and used for irrigation in vicinity of Lihue and Kapaa. Flow regulated by spillway and head gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 22 44 25.5 32.5 52 24 30.5 38. £ 20.5 43 34.5 48 2 23.5 51 25 44 44 23.5 26.5 51 19.9 33 41 47 3 31.5 50 29 34.5 34.5 22.5 24.5 41 19.5 34.5 42 41 4 42 42 36.5 42 36.5 22 23.5 36. e 19.1 27 47 34.5 5 36.5 36.5 28 30 44 21.5 23 32 IS. 7 30.5 34.5 28 6 44 36.5 34.5 32 42 21 22 27 20.5 46 28.5 26 7 46 30.5 36.5 26.5 40 21 23 31. e 27.5 34.5 2S.5 25 8 31 30.5 29.5 34.5 37.5 20.5 27.5 26. e 51 31 34.5 25 9 39 28.5 25.5 28.5 34.5 21.5 22 32. e 34 39 34.5 32.5 10 39 26.5 24 25 34.5 20.5 20.5 31.5 31 56 33.5 46 11 36.5 29.5 25.5 24 29.5 25.5 20.5 47 31 53 29 44 12 34.5 32 36.5 24 27.5 31 19.9 52 46 43 31.5 40 13 29 26.5 24 25 25.5 21 19.9 40 47 42 36.5 31.5 14 30 30 23 30.5 24 20.5 19.5 32 50 37.5 28.5 34.5 15 34.5 39 22.5 45 23.5 21.5 19.5 31.5 44 34.5 25.5 35.5 16 42 52 25 33 23 21 19.1 26.5 37.5 29.5 24 31.5 17 50 55 23 30 22.5 20.5 19.0 24. e 31 28.5 22.5 34.5 18 36.5 41 23 39.5 21.5 20.5 19.1 24 38 26.5 21.5 29.5 19 31.5 34.5 22 27.5 21 19.9 19.5 23 31.5 28 21 26 20 42 30 21.5 25 23.5 21.5 IS. 7 22 33 25 24.5 27.5 21 39 27 22 24.5 24.5 19.9 18.7 21. E 2S.5 23.5 37 26 22 36.5 26 25 26.5 21.5 20.5 18.7 21 24.5 23 24 27.5 23 34.5 31 26.5 29 24.5 29 28 22 29.5 22.5 22.5 25 24 30 26.5 28.5 34 42 39 21.5 20.5 24 22 21 22.5 25 42 28.6 32 28 55 44 19.5 20.5 40 22.5 33.5 22 26 40 29.5 27.5 24 36.5 50 27 20.5 46 31.5 44 21.5 27 39 30 28.5 23 29.5 42 47 22 47 23 31.5 22 28 34.5 39 41 25 26.5 46 54 19.9 36 22.5 34.5 23 29 44 42 34.5 54 25.5 42 53 36 23 36.5 27.5 30 39 31 34.5 44 24 39 39 40 28.5 34.5 28 31 34.5 27 50 37 39 48 40

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 50 22 36.6 56.6 1,130 3,480 Auff 55 26 34.9 54.0 1,080 3,320 Sep 41 21.5 28.0 43.3 840 S,580 Oct 54 23 32.1 49.7 995 3,050 Hov 55 21 31.7 49.0 950 S,920 Dec 50 19.9 27.4 42.4 849 2,610 0 alendar year 193 61 .09 33.4 51.7 12,170 37,390 Jan 54 18.7 25.9 40.1 803 2,460 Pet 52 19.9 29.9 46.3 838 2,570 Mar 51 18.7 33.9 52.5 1,050 3,220 Apr 56 22 32.1 49.7 964 2,960 May 47 21 31.7 49.0 982 3,010 Jun 48 21.5 31.1 48.1 932 2,860 P Iseal year 1937- 56 18.7 31.3 48.4 11,410 35,040 18 ISLAND OF KAUAI

North Wailua ditch near Lihue

Location.- Weir control, lat. 22°03'40", long. 159°27'55", 300 feet downstream from ln- take diversion dam on North Fork of Wailua River, 8 miles west of Wailua, and 8-J miles northwest of Lihue. New weir, with crest 0.02 foot higher than old weir of same dimensions, installed Apr. 14. Zero of gage is 1,105.45 feet above mean sea level, by Lihue Plantation Co. levels. Records available.- July 1932 to June 1938. Records from 1926 to June 1932 obtained by Lihue Plantation Co. Extremes.- Maximum discharge during year, 47 million gallons a day (73 second-feet) June 1 (gage height, 1.35 feet); no flow for several periods of a few days each, when water was diverted around station. 1932-38: Maximum discharge, 59 million gallons a day (91 second-feet) Feb. 25, 1935 (gage height, 1.57 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records excellent. Flow regulated by gates. No diversions. Water used for power and irrigation in vicinity of Lihue.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 13.6 19.4 15.6 18.1 12.6 14.4 12.0 10. C 12.9 0 15.5 14.4 2 13.9 14.3 15.2 22 12.3 14.2 12.3 11. C 12.9 5.4 17.1 8.6 3 19.6 12 .9 18.0 19.0 12.4 13.6 12.6 9.8 12.5 13.2 18. S 11.1 4 2S.5 12.0 21 21 12.6 13.3 12.6 9.6 12.5 3.1 18.8 11.8 5 23 12.9 17.3 17.6 12.3 13.3 12.6 9 c 12.6 .07 18.1 11.5 6 32 12.9 18.4 19.2 11.4 12.9 12.6 11. C 13.9 .04 17.6 12.0 7 25.5 12.3 18.7 17.3 11.7 If?. 9 13.3 12.2 14.1 0 17.8 13.3 8 15.9 12.3 17.3 19.7 12.0 12.6 14.2 12. C 12.3 9.4 17. S 15.2 9 16.2 15.6 15.2 17.6 12.3 13.3 12.9 12. £ 12.3 12.7 17.1 15.8 10 15.9 17.4 15.2 15.6 12.6 12.6 12.6 12.9 12.3 13.9 17.8 14.0 11 17.0 18.0 15.6 15.2 12.3 17.8 12.3 13.2 11.4 33.5 17.1 13.3 12 16.1 18.7 20 15.9 12.3 18.8 12.3 12.6 12.2 -11 17.2 12.7 13 15.6 17.6 15.9 16.2 12.3 13.6 12.6 11. C 12.2 0 18.1 12.0 14 20 19.8 14.9 20.5 12.3 13.6 12.3 11.4 12.5 4.5 15.5 12.4 15 19.3 22.5 14.0 29 12.0 14.2 12.0 12.6 11.0 11.5 15.0 12.6 16 35 24.5 17.5 19.8 12.3 12.8 11.7 12. e 11.7 11.5 14.9 12.4 17 18.1 13.6 15.6 21 12.3 12.3 11.7 12.6 12.9 11.8 14.3 12.4 18 15.2 12.2 14.8 18.6 12.3 12.0 12.0 12.9 13.2 11.8 13.6 12.4 19 15.7 16.2 14.2 15.6 12.9 12.0 12.3 12.6 12.2 11.9 13.3 11.8 20 16.2 18.7 13.9 15.4 12.9 14.7 12.0 12.6 12.9 12.0 14.2 12.1 21 19.4 17.0 14.2 15.2 13.3 12.6 12.0 12.6 12.5 12.3 18.9 11.8 22 19.4 17.0 15.8 14.9 12.9 12.9 11.7 12.6 12.3 12.7 14.6 13.0 23 20 19.4 20 15.2 13.3 14-2 15.2 12.9 12.8 12.7 13.3 13.0 24 19.0 17.0 20.5 15.9 18.0 20.5 12.4 12.6 12.5 12.7 13.0 12.9 25 20 18.4 22.5 15.2 13.5 16.9 12.0 13.3 12.9 12.8 24 13.0 26 19.4 18.7 1S.O 14.9 9.3 11.8 18.3 12.6 12.0 14.6 33.5 12.7 27 18.7 18.7 17.7 14.2 8.7 11.7 32.5 13.9 9.7 14.0 20 13.6 28 18.7 21 11.1 14.5 8.2 12.3 21 13.3 9.4 13.6 24 15.2 29 21.5 21.5 12.3 12.9 11.0 13.6 10.1 12.4 13.8 25 16.9 30 20 19.0 15.4 11.7 14.6 12.9 9.2 13.8 15.0 21.5 17.1 31 18.0 13.9 12.0 12.9 9.8 3.65 24

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 35 13.6 19.6 30.3 606 1,860 Augi 24.5 12.0 16.9 26.1 525 1,610 Sep 22. £ 11.1 16.5 25.5 496 1,520 Oct 29 11.7 17.1 26.5 531 1,630 HOT 18.0 8.2 12.3 19.0 369 1,130 Dec 20.5 11.7 13. S 21.4 427 1,310 C alendar year 193' 35 5.9 14.7 22.7 5,360 16,440 Jan 32.5 9.2 13.3 20.6 413 1,270 Feb 13.9 9.5 12.1 18.7 339 1,040 Mar 14.1 3.65 12.1 18.7 374 1,150 Apr 33.5 0 10.0 15.5 301 923 May 33.5 13.0 18.1 28.0 561 1,720 Jun 17.1 8.6 13.0 20.1 391 1,200 PIscal year 1937-C 35 0 14.6 22.6 5,330 16,360 ISLAND OF KAUAI 19

Stable storm ditch near Lihue

Location.- Weir control, lat. £2°04'00", long. 159°26'45", 100 feet downstream from in- take, 7.8 miles northwest of Lihue, and 8.2 miles west of Kapaa. Records available.- December 1936 to June 1938. Records for April 1931 to December 1936 obtained by Lihue Plantation Go. from staff gage at site 1 mile downstream. Extremes.- Maximum discharge during year, 48 million gallons a day (74 second-feet) Jan. 28 (.gage height, 1.76 feet); no flow at times, when water was shut out of ditch. 1936-38: Maximum discharge, that of Jan. 28, 1938; minimum, no flow at times, when water was shut out of ditch. Remarks.- Records excellent. Ditch diverts water from North Fork of Wailua River for irrigation of sugarcane in vicinity of Lihue. Flow regulated by head gates.

Discharge, In million gallons, fiscal year July 1937 to June 19W

Day July Aug. Sept. Nov. in. Feb. Mar. Apr. May June

1 19.8 0 0 0 0 0 0 0 0 2 21.5 0 0 0 0 0 0 0 1.35 3 28 0 0 0 0 0 0 0 .19 4 36.5 0 0 0 O o 10.8 0 .19 5 35 0 0 0 0 0 19.8 0 0 6 14.4 0 0 0 0 0 19.8 0 0 7 0 0 0 0 0 0 24.5 0 0 8 0 0 0 0 0 0 18.2 0 0 9 0 0 0 0 0 0 0 0 .18 10 0 o 0 0 0 o 0 0 0 11 O 0 0 0 12.5 0 0 0 0 12 0 11.7 0 o 24.5 0 0 0 0 13 0 14.5 0 3.4 18.2 0 0 0 0 14 0 14.7 4.1 7.7 17.6 0 0 0 0 15 0 15.3 0 9.6 17.6 0 0 0 0 16 0 12.5 0 7.7 17.3 0 0 0 0 17 0 0 0 7.7 17 0 0 0 0 18 0 0 7.8 8.9 16.4 0 0 4.9 0 19 0 0 15.6 4.4 16.2 0 0 0 4.2 20 0 0 15.6 0 18 14.2 0 0 15.9 21 0 0 15.3 0 16.4 21.5 0 0 17.3 22 0 0 15.9 0 16.4 19.8 0 0 15.9 23 0 0 16.3 0 22 24.5 0 0 15.6 24 0 0 16.7 0 29.5 24.5 0 0 15.3 25 0 0 17 0 31 21.5 0 0 19.8 26 0 0 16.7 0 35 24.5 0 0 6.1 37 0 0 4.9 0 16.2 33 0 0 10.8 28 0 0 0 0 0 36.5 0 0 15.3 29 0 0 0 0 0 16 0 0 4.6 30 0 0 0 0 0 0 0 0 0 31 0 0 0 0 0 0 0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 36.5 0 5.01 7.75 155 476 Augi 15.3 0 2.22 3.43 68.7 211 Sep 17.0 0 4.86 7.52 146 448 Oct 9.6 0 1.59 2.46 49.4 152 Nov 0 0 0 0 0 0 Dec 35 0 11.0 17.0 342 1,050 C alendar year 193 36.5 0 3.59 5.55 1,310 4,020 Jan 36.5 0 7.61 11.8 236 724 Fob 0 0 0 0 0 0 Mar 24.5 0 3.00 4.64 93.1 286 Apr 4.9 0 .163 .252 4.9 15 May 19.8 0 4.60 7.12 143 438 Jun 0 0 0 0 0 0 Piscal year 1937- 36.5 0 3.39 5.25 1,240 3,800 20 ISLAM) OF KAUAI

Kanaha ditch near Lihue

Location.- Sharp-crested weir, lat. 22°03'50", long. 159 025'30", 750 feet downstream from intake and 7 miles northwest of Lihue. Altitude, 540 feet by barometer. Records available.- August 1910 to June 1938. Average discharge.- 18 years (1916-22, 1926-38), 7.99 million gallons a day (12.4 second-feet). Extremes.- Maximum discharge during year. 13.3 million gallons a day (20.6 second- feet) Dec. 12 (gage height, 0.54 foot); no flow several days during year, when in­ take gate was closed. 1910-38: Maximum discharge recorded, 45 million gallons a day (70 second-feet) Dec. 24, 1927 (gage height, 3.22 feet, former site and datum); no flow occasionally, when water was shut out of ditch. Remarks.- Records good. Diverts water from North Fork of Wailua River for irrigation of sugarcane in vicinity of Lihue. Flow regulated by head gate.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dee. Jan. Feb. Mar. Apr. May June

1 5.1 5.3 6.2 5.9 2.4 2.2 2.4 2.2 5.1 1.78 5.1 3.2 2 5.3 5.1 6.2 6.2 2.1 2.2 2.2 2.4 5.1 1.78 5.3 1.40 3 8.6 5.1 6.5 5.9 1.98 2.2 2.2 1.78 5.1 1.78 5.3 1.40 4 10.9 4.3 6.5 6.2 1.98 2.2 2.2 .83 3.65 1.78 5.6 4.5 5 8.3 4.8 5.9 5.9 2.2 3.4 1.98 .21 2.8 1.78 5.6 5.5 6 5.9 4-8 6.2 6.2 2.2 5.9 1.98 .98 3.0 1.98 5.1 5.6 7 5.3 4.8 6.2 6.2 2.2 5.9 1.98 1.40 5.3 1.78 5.3 5.6 8 5.3 4.8 6.2 6.2 1.98 5.9 1.98 1.58 7-8 1.78 5.6 5.6 9 5.1 2.45 5.9 5.9 1.98 5.9 1.98 1.58 4.8 1.98 5.6 5.9 10 5.1 0 5.9 5.9 1.98 6.2 3.3 1.58 4.5 2.2 5.4 2.6 ' 11 5.1 0 5.9 5.9 1.98 5.4 6.2 1.78 4-3 1.98 5.6 1.78 12 5.1 2.3 6.2 6.2 1.98 5.8 5.9 1.32 4.8 1.78 5.9 1.78 13 5.6 4.2 5.9 5.9 1.78 2.1 5.9 .79 5.1 1.78 4.4 4.9 14 5.6 .70 5.3 5.9 1.58 4.3 5.9 1.58 5.9 1.58 .80 5.6 15 5.6 1.09 6.2 6.5 1.58 6.8 5.9 1.58 5-4 1.58 1.40 5.6 16 5.3 .69 6.2 5.9 1.58 6.5 5.6 1.58 5.1 1.40 2.65 5.6 17 5.3 .70 6.1 6.2 1.40 6.5 5.9 1.58 5.3 2.2 3.25 5.7 18 5.1 0 5.6 3.3 1.58 6.5 6.1 1.40 5.9 5.1 3.2 4.0 19 5.6 0 4.6 1.38 2.6 6.5 6.2 1.40 5.6 5.3 5.7 2.55 20 5.6 1.13 5.6 1.40 5.2 6.9 3.6 1.40 5.6 5.1 5.1 5.6 21 3.65 .36 5.9 1.40 5.6 6.7 2.4 1.40 5.3 5.1 5.6 5.6 22 2.35 .92 6.2 1.24 6.2 6.8 2.8 2.8 5.1 5.1 5.3 5.3 23 2.B 3.1 5.8 1.09 5.9 5.4 3. '6 5 5.6 5.1 5.3 5.1 5.3 24 2.8 .80 6.2 1.09 5.6 1.45 4.3 5.3 5.3 5.3 4.6 5.6 25 3.0 1.12 6.2 1.40 1.52 2.4 3.2 5.3 5.9 5.6 5.1 5.6 26 3.05 3.15 6.2 1.88 1.67 1.51 5.1 5.3 3.75 5.6 5.6 5.5 27 3.05 6.2 6.1 1.78 2.2 1.17 6.2 5.6 .31 5.3 5.1 5.6 28 4.3 6.2 5.4 1.58 1.98 2.2 1.76 5.1 1.09 5.1 5.6 5.6 29 4.8 5.9 5.6 2.2 2.4 2.2 .43 1.78 5.1 5.6 5.2 30 4.8 5.9 5.9 2.1 2.3 2.2 1.58 1.78 5.1 5.6 5.1 31 5.1 6.2 2.4 1.90 2.4 1.78 5.9

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 10.9 2.35 5.11 7.91 158 486 Aug 6.2 0 2.97 4.60 92.1 283 Sep 6.5 4.6 5.96 9.22 179 549 Oct 6.5 1.09 4.10 6.34 127 390 HOT 6.2 1.40 2.59 4.01 77.6 238 Dec 6.9 1.17 4.30 6.65 133 409 C alendar year 193 10.9 0 4.01 6.20 1,460 4,500 Jan 6.2 .43 3.65 5.65 113 347 Feb 5.6 .21 2.33 3.61 65.4 201 Mar 7.8 .31 4.43 6.85 137 421 Apr 5.6 1-40 3.30 5.11 99.0 304 May 5.9 .80 4.87 7.54 151 463 Jun 5.9 1.40 4.63 7.16 139 426

P Iscal year 1937- 10.9 0 4.03 6.24 1,470 4,520 ISLAND OF KAUAI

Wailua ditch, near Kapaa

Location.- Lat. 22°04'25", long. 159°24'05", 2,000 feet downstream from Wailua Reser- voir, 5i miles west of Kapaa, and 7 miles north of Lihue. Altitude, 462 ± 5 feet, by estimating slope of 2,000 feet of length of ditch from Lihue Plantation Co. levels. Records available.- November 1936 to June 1938. Records obtained by East Kauai Water (Jo. July 1922 to April 1932 at site 2 miles upstream, below intake, and April 1932 to .November 1936 at present site. Extremes.- Maximum discharge during year, 40 million gallons a day (62 second-feet) uec. 24 (gage height, 5.62 feet); minimum, 2.7 million gallons a day (4.2 second- feet) Jan. 3. 1936-38: Maximum discharge, 45 million gallons a day (63 second-feet) June 5, 1937 (gage height, 3.54 feet); minimum, 0.7 million gallons a day (1.1 second-feet) Dec. 16, 17. Remarks.- Records excellent. Diverts water from North Fork of Wailua Stream to reser- voir 2,000 feet above station and thence to fields for irrigation of sugarcane. Flow regulated by gates at reservoir. Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June

1 33.5 6.6 30.5 10.1 11.7 15.1 8.6 9.1 29 8.1 11.2 22.5 2 30.5 6-6 30.5 9.6 .6 20.5 8.1 9.1 34.5 7.6 22.5 37.5 3 21 6.6 30.5 8.6 .6 25 7.2 7.1 37.5 7.6 24 37.5 4 9.3 6.6 21 8.6 6 8.6 24 7.1 37.5 7.6 18.7 21.5 5 10.9 6.6 10.0 7.6 .6 8.6 34.5 7.6 32 7.6 18.7 10.1 6 30.5 6.6 30 6.6 6 23.5 33.5 7.6 26.5 9.6 18.7 25.5 7 32.5 6.6 34.5 11.2 .6 29 32 7-6 14.4 13.9 15.1 34.5 8 20 9.3 36 22.5 7.6 26.5 19.4 7.6 8.1 21 13.9 37.5 9 18.7 20.5 33.5 19.6 9.3 34.5 26 8.1 6.6 19.6 32 39 10 15.2 32 8.6 12.2 34.5 32 8.6 6.6 11.8 36 22.5 11 11.3 34.5 28 20 9.8 27.5 32 9.1 6.6 25 37.5 9.1 12 18.7 34.5 21 26.5 16.3 21 34.5 8.1 6.6 24 37.5 8.1 13 18.7 34.5 36 27.5 12.2 36 33.5 7.6 6.6 24 37.5 7.6 14 28 26 36 27.5 8.6 34.5 33.5 7.1 6.2 20 25.5 7.6 15 24.5 8.4 36 34.5 10.5 33.5 23.5 7.1 6.2 10.6 12.2 7.6 16 16.3 23 37.5 29 29 32 10.9 7.1 6.2 13.4 29 7.6 17 9.8 19.1 37.5 15.6 36 32 22.5 7.6 6.2 11.2 34.5 8.1 18 8.8 8.1 37.5 27.5 37.5 25 27.5 8.6 8.6 21 34.5 8.1 19 12.1 7.7 20.5 26.5 39 13.5 29 9.1 10.1 26.5 36 8.1 20 16.3 6.2 37.5 19.9 29 21 33 .5 9.1 11.7 26.5 36 22 21 16.3 6.2 36 16.3 18.8 26.5 33.5 9.1 16.3 22.5 26.5 29 22 16.3 6.2 35.5 16.3 36 29 24.5 11.5 18.7 15.1 13.4 29 23 16.3 6.2 34.5 12.2 36 29 10.5 21 24 10.6 28 29 24 9.9 6.2 36 10.1 34.5 25 22.5 21 24 8.6 36 36 25 8.2 6.2 37.5 15.1 21.5 7.1 24 21 24 24.5 37.5 27 26 8.2 6.2 39 16.3 7.6 7.6 17.5 16.6 18.3 33.5 40 17.1 27 8.2 10.4 39 16.3 7.6 7.6 21 11.7 9.1 33.5 40 36 28 9.5 14.5 28 16.3 7.6 8.1 20 25 9.1 26 37.5 29 13.4 8.6 17.4 16.3 7.6 8.1 9.1 9.1 33.5 9.1 39 30 10.6 10.2 9.6 11.7 10.1 8.6 9.1 9.1 27 9.1 39 31 6.6 21.5 9.4 8.6 8.6 9.1 14.5

Million gallons a day Second- Total run-off Month feet MaT^Tinim (mean) Million Acre-feet Minimum Mean gallons Jul 33.5 6.6 16.5 25.5 510 1,570 Augi 34.5 6.2 13.4 20.7 414 1,270 Sap 39 9.6 31.0 48.0 928 2,850 Oct 34.5 6.6 16.9 26.1 524 1,610 NOT 39 7.6 16.7 25.8 502 1,540 Dec 36 7.1 21.5 33.3 667 2,050 C alendar year 193 41 3.7 15.8 24.4 5,760 17,700 Jan 34.5 7.2 22.8 35.3 706 2,170 Pet) 25 7.1 10.6 16.4 297 911 Mar 37.5 6.2 15.4 23.8 478 1,470 Apr 11...... 40 ' 7.6 18.6 28.8 559 1,720 May 9.1 26.2 40.5 811 2,490 Jun 39 7.6 23.4 36.2 701 2,150 P Iscal year 1937- 58 40 6.2 19.4 30.0 7,100 21,800 22 ISLAND OP KAUAI

East Branch, of North. Fork of Wailua River near Lihue

Location.- Lat. 22°04'10", long. 159°25'05", 1,200 feet upstream from confluence with NorttT'Fork and 7i miles northwest of Lihue. Altitude, 500 feet, by barometer. Drainage area.- 6.2 square miles. Records available.- July 1912 to June 1938. Average discharge.- 18 years (1920-38), 31.9 million gallons a day (49.4 second-feet). Extremes.- Maximum discharge during year, 1,010 million gallons a day (1,560 second- feet) Sept. 28 (gage height, 6.93 feet), from rating curve extended above 270 million gallons a day; minimum, 11.0 million gallons a day (17.0 second-feet) Dec. 19. 1912-38: Maximum discharge, 3.340 million gallons a day (5,170 second-feet) Dec. 24, 1927 (gage height, 10.57 feet), from rating curve extended above 500 million gallons a day; minimum, 4.4 million gallons a day (6.8 second-feet) July 3, 13, 1926. Remarks.- Records good. No diversions above station.

Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) July 1 to July 19 July 20 to June 30 1.0 9.8 1.1 10.2 2 3 1.2 16.4 1.2 13.0 112 1.4 25 1.4 20 153 1.6 35.5 1.6 29 215 1.9 54 1.8 41 293 2.2 76 2.0 55

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 12.2 27 19.9 25 113 17.8 27 45 14. 56 23.5 97 2 12.2 48 18.9 60 58 17.5 23 246 14. 31.5 30.5 71 3 16.0 62 20 26.5 37.5 16.8 21 97 14. 35 44 44 4 37 38 27.5 32 38 16.1 19.3 77 13. 26 48 31 5 24.5 29 21 23.5 44 15.4 17.8 55 13. 33.5 27 26.5 6 31 32 22 24 45 15.0 17.1 41 13.7 63 22.5 23.5 7 54 23 27.5 21.5 38 14.4 16.8 38 65 30 27 22 8 23.5 21 23 26 29.5 14.0 20.5 31 142 27 27 21.5 9 40 20 18.6 22 29 13.3 16.4 28.5 48 44 30 23 10 24 18.9 17.1 18.6 31 13.3 15.4 27.5 28 152 28.5 90 11 23.5 20.5 17.1 17.8 27 12.7 14.7 46 27 95 24 78 12 23 23.5 24.5 17.5 23.5 13.3 14.4 154 53 55 27.5 47 13 19.7 18.2 16.8 17.5 21.5 12.2 14.0 67 60 48 27 31 14 20 21.5 15.4 18.2 20 11.9 13.7 41 92 41 22 31.5 15 20.5 25 14.4 29 19.3 12.2 13.0 35.5 73 35 20 36 16 35.5 71 16.8 19.3 18.6 12.2 12.7 30 44 34 18.6 28.5 17 58 212 15.7 19.6 17.8 11.9 12.4 27.5 34.5 29 17.8 32 18 31.5 44 14.0 67 17.1 11.6 12.4 26 41 27 17.1 29.5 19 24 32 13.7 21 16.4 11.3 12.2 23.5 33 36 16.4 24 20 37.5 27.5 13.0 18.2 16.1 11.6 14.7 22 34 29.5 17.8 24.5 21 24 25.5 13.0 17.1 11.6 13.0 20 29.5 25 30 21.5 22 23 22 14.4 17.1 #15.0 11.3 11.9 19.3 24 22 17.5 19.3 23 27 22 16.4 16.4 14.7 43 17.3 18-6 27 21 16.1 18.2 24 20.5 19.6 21 21 24 50 15.7 17.8 22 20 15.4 17.1 25 39 19.3 28 17.5 192 59 11.9 17.1 22 19.3 25.5 16.8 26 34 20.5 20.5 15.4 43 110 11.9 16.1 99 25.5 55 16.1 27 27 18.9 44 14.4 28 52 20.5 15.7 74 19.3 24 15.4 28 21 26.5 157 26 *23. 5 44 146 15.4 38 18.2 26.5 15.0 29 22.5 70 32 103 *21.5 38 198 31 18.9 30 16.8 30 27.5 33 31.5 48 36 65 29.5 21.5 27 19.6 31 20.5 23 82 37.5 57 55 37

Million gallons a day Second- Total run-off Month feet (mean Million Acre-feet Maximum Minimum Mean gallons Jul 58 12.2 27.5 42.5 854 2,620 Augi 212 18.2 35.9 55.5 1,110 3,410 Sep 157 13.0 25.2 39.0 755 2,320 Oct 103 14.4 29.1 45.0 902 2,770 Hov 192 14.7 35.3 54.6 1,060 3,250 Dec 110 11.3 24.7 38.2 767 2,350 C alendar year 193 504 11.3 37.0 57.2 13,490 41,420 Jan 198 11.9 28.9 44.7 897 2,750 Fefc 246 15.4 46.4 71.8 1,300 3,980 Mar 142 13.7 42.3 65.4 1,310 4,020 Apr 152 18.2 37.9 58.6 1,140 3,490 May 55 15.4 26.5 41.0 820 2,520 Jun 97 15.0 32.9 50.9 987 3,030 F iscal year 1937- 246 11.3 32.6 50.4 11,900 36,510

*Gage height missing; discharge computed on basis of records for stations'on nearby streams. ISLAND OF KAUAl 23

Kapaa River at Kapahl ditch intake, near Kapaa

Location.- Concrete masonry dam, lat. 82°06'05", long. 159°22'30", 4 miles northwest cf Kapaa and 4.5 miles northwest of Wallua. Altitude, 365 feet, by barometer. Drainage area.- 3.3 square miles. Records available.- December 1936 to June 1938. July 1910 to May 1915, at site half a mile upstream, known as "Kapaa River at Kapaa." June 1915 to April 1920, at site three-quarters of a mile upstream, known as "Kapaa River near Kealla." Extremes.- Maximum discharge during year. 1,270 million gallons a day (1,960 second- feet) Aug. 17 (gage height, 3.00 feet), from rating curve extended above 330 million gallons a day; no flow at times, when low flow is diverted into Kapahi ditch. 1936-38: Maximum discharge, 3,390 million gallons a day (5,250 second-feet) Mar. 19, 1937 (gage height, 4.50 feet), from rating curve extended above 330 million gal­ lons a day; no flow at times when low flow is diverted into Kapahi ditch. Remarks.- Records good except those above 400 million gallons a day, which are poor. Entire low flow is diverted into several ditches above station.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day)

-0.05 0 0.40 14.D 1.30 166 .00 .3 .50 21.5 1.50 234 .10 1.3 1.70 318 .20 4.0 .90 70 .30 8.2 1.10 111 Discharge, In million gallons, fiscal jear July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 0 19.3 2.4 4.0 98 12.9 21.5 61 1.2 48 14.1 49 2 0 34 2.6 22.5 34.5 7.7 17.8 310 .6 21.5 15.6 35 3 .1 32 6.9 5.7 21 6.2 14.8 54 0 26 39.5 23.5 4 15.0 19.3 22.5 13.1 22 4.1 1.4 55 0 17.8 « 27 17.1 5 13.5 10.4 2.6 .1 22.5 4.9 4.8 32.5 .9 25 6.3 16.3 6 17.1 5.4 4.4 4.9 19.3 0 4.2 20 1.2 43 5.2 4.2 7 45 .8 4.7 .3 19.3 1.7 1.0 31 143 1.2 6.9 0 8 9.3 2.4 .5 10.2 16.0 2.3 .6 19.3 112 1.4 25 0 9 8.8 .4 0 4.4 17.1 2.4 0 19.3 27.5 19.4 7.8 .2 10 5.2 .1 0 1.4 19.3 .7 0 18.5 21 84 5.7 59 11 9.3 3.4 0 0 17.8 0 0 46 22.5 32 4.6 76 12 7.4 7.5 18.0 .9 10.6 0 0 130 46 14.0 S.O 26 13 .8 7.0 .4 .1 10.0 0 0 39.5 41 12.4 21 18.3 14 2.0 9.1 0 1.1 10.9 0 0 17.7 48 13.3 13.0 21 15 9.5 13.9 0 4.4 1.2 0 .7 15.5 38 19.3 8.8 23.5 16 18.8 35.5 0 2 »8 0 0 3.1 15-8 23.5 9.9 5.1 15-6 17 38.5 254 0 19.8 0 0 0 14.8 12.9 15.6 3.3 20-5 18 22.5 26 0 53 0 0 0 14.8 10.2 1.5 2.9 17. S 19 8.0 18.0 0 12.5 0 0 0 14.1 6.4 55 3.8 14.7 20 16.0 16.3 0 12.5 0 0 4.6 14.1 20 9.5 2.5 15.7 21 13.6 15.6 0 6.6 0 0 .6 12.8 3.0 6.1 14.1 15.6 22 11.1 15.2 0 11.5 0 0 0 12.5 3.8 11.7 5.0 9.3 23 12.6 16.3 0 12.9 0 4.0 13.9 5.7 12.0 10.6 .6 .7 24 2.4 4.2 .5 23 10.8 18.1 2.7 4.0 5.3 12 . 9 0 0 25 29.5 .1 0 13.2 123 33.5 1.7 2.6 10.4 l!2 11.2 0 26 22 .1 .2 8.4 19.3 58 .4 .9 111 12.6 35.5 3.7 27 26 0 18.9 4.0 15.6 44 0 30 62 .6 6.9 .4 28 12.4 2.2 57 26 135 52 110 .8 12.6 0 9.4 0 29 10.7 55 11.7 89 12.9 30 120 9.5 0 15.6 .5 30 19.2 10.1 18.0 38 12 .9 27 36.5 25.5 7.9 4.8 0 31 11.8 1.7 64 37.5 26 76 .2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 45 0 13.5 20.9 418 1,280 Augi 254 0 20.5 31.7 635 1,960 Sep 57 0 5.71 8.83 171 526 Oct 89 0 15.2 23.5 470 1,440 HOT 123 0 18.2 28.2 548 1,680 Dec 58 0 11.2 17.3 347 1,060 C alendar year 193 563 0 21.8 33.7 7,970 24,450 Jan 120 0 12.5 19.3 386 1,190 Peb 310 .8 35.2 54.5 985 3,020 Mar 143 0 29.3 45.3 907 2,780 Apr 84 0 17.8 27.5 533 1,640 May 39.5 0 10.6 16.4 329 1,010 Jun 76 0 16.1 24.9 484 1,480 F iscal year 1937- 310 0 17.0 26.3 6,210 19,060 24 ISLAND OF K&UAI

Kapahi ditch near Kealia

Location.- Parshall flume, lat. 22°06'00", long. 159°22'30", 500 feet downstream from. intake and 4J miles west of Kealia. Control, which had been a 20-foot weir, was changed to a 4-foot Parshall flume Nov. 26, 1936, and datum lowered 2.52 feet. Altitude, 360 feet, by barometer. Records available.- April 1909 to May 1914, May 1915 to June 1938. Average discharge.- 20 years (1917-20, 1921-38), 6.84 million gallons a day (10.6 second-feet). Extremes.- Maximum discharge during year, 39.5 million gallons a day (61.1 second-feet) July 4 (gage height, 2.35 feet); no flow occasionally, when water was shut out of ditch. 1909-14, 1915-38: Maximum discharge, 233 million gallons a day (361 second-feet) Mar. 31, 1923 (gage height, 3.15 feet); no flow occasionally, when water'was shut out of ditch. Remarks.- Records excellent. Ditch diverts water from Kapaa River for irrigation In vicinity of Kapaa. Flow regulated by head gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.2 0.31 4.2 6.7 0.22 0.80 0.07 0.85 4.1 1.69 0.35 11.2 2 3.8 5.3 3.05 4.4 .16 4.4 .07 1.2 4.7 .50 7.1 7.9 3 7.0 7.8 4.0 3.6 1.78 2.3 .09 0 4.9 .45 .40 3.45 4 14.8 5.3 3.8 5.7 .19 2.1 11.1 .02 4.9 .40 7.1 2.3 5 6.0 8.0 7.8 7.3 1.20 1.40 7.2 0 5.1 .35 13.1 .23 6 7.3 12.0 7.2 6.0 .35 5.5 7.0 0 3.05 .31 9.5 4.9 V 3.9 9.9 11.8 6.6 .35 4.1 9.1 0 3.0 12.2 9.3 5.1 8 9.9 7.8 12.9 5.6 .27 3.7 12.8 0 .16 11.1 1.99 6.9 9 10.8 8.7 8.2 3.9 .23 3.7 5.7 0 .73 7.7 13.8 7.2 10 7.7 7.4 6.7 4.4 .23 4.4 5.2 0 .27 10.2 14.7 8.7 11 3.3 6.6 7.4 5.1 1.17 3.25 5.0 0 .27 20.5 10.4 .21 12 2.9 6.2 4.1 4.9 5.1 3.45 5.5 .01 .27 14.5 10.1 .16 13 9.0 2.5 7.3 5.3 3.9 3.15 3.45 0 .70 13.1 6.6 .16 14 8.8 5.8 5.2 6.7 1.82 2.95 3.35 0 8.3 11.5 4.4 .57 15 2.2 7.6 4.0 7.8 9.9 2.95 2.55 .03 8.7 1.48 4.6 .35 16 1.83 7.4 8.0 5.0 7.2 2.95 .84 .04 2.65 7.8 5.9 .31 17 3.5 .88 5.7 2.7 4.7 2.95 3.35 .22 6.6 3.25 4.3 .31 18 .23 .40 3.9 3.6 4.5 3.35 3.4 1.45 16.1 10.4 3.6 .27 19 12.4 .35 3-7 3.6 4.4 2.85 4.3 .94 11.3 12.3 5.1 1.54 20 14.7 .35 4.6 1.9 5.8 4.0 3.5 .16 1.38 16.5 6.4 9.1 21 6.0 .40 4.6 6.4 4.9 4.6 8.4 1.16 17.9 9.7 14.7 3.75 22 7.8 .35 4.9 3.2 5.2 2.95 7.4 1.07 11.2 4.7 4-5 2.05 23 4.6 8.2 8.0 1.96 5.1 7.3 1.80 6.3 5.3 4.2 5.9 5.9 24 8.0 9.4 11.2 1.84 5.0 15.1 5.0 5.4 9.0 1.64 6.0 5.7 25 .90 10.4 8.5 3.65 .31 .23 2.8 2.7 8.2 11.8 10.8 5.6 26 4.0 9.9 7.4 4.7 .43 .20 3.45 4.1 6.4 8.4 12.8 1.75 2V .31 6.5 5.2 4.0 .93 .10 4.5 1.71 .13 8.0 7.4 5.0 28 1.36 9.4 3.25 2.8 .93 .10 10.1 4.5 13.8 7.4 7.2 4.2 29 4.0 7.6 2.5 .13 .86 .07 .31 11.9 8.0 .80 5.5 30 3.15 10.9 3.7 .10 .93 .07 .23 9.8 5.1 8.0 9.4 31 1.93 7.7 1.93 .07 .19 5.4 12.2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum He an gallons Acre -feet Jul 14.8 0.23 5.69 8.80 176 541 Augi 12.0 .31 5.93 9.18 184 565 Sep 12.9 2.5 6.09 9.42 183 561 Oct 7.8 .10 4.24 6.56 132 404 NOT 9.9 .16 2.60 4.02 78.1 240 Dec 15.1 .07 3.07 4.75 95.0 292 C alendar year 193 15.1 0 3.67 5.68 1,340 4,120 Jan 12.8 .07 4.44 6.87 138 423 Pet) 6.3 0 1.14 1.76 31.9 98 Mar 17.9 .13 6.01 9.30 186 571 Apr 11...... 20.5 .31 7.51 11.6 225 691 May 14.7 .35 7.39 11.4 229 703 Jun 11.2 .16 3.99 6.17 120 367 P Iscal year 1937- 20.5 0 4.87 7.54 1,780 5,460 ISLAND OF KAUAI 25

Makaleha ditch near Kealia

Location.- Parshall flume, lat. 22°06'55", long. 159°02'00", at end of last tunnel fronTwhich water spills down slope into Mimino Reservoir, 3.9 miles northwest of Kealia and 4.1 miles northwest of Kapaa. Records available.- November 1936 to June 1938. Equivalent records for July 1925 to November 1936, at 150 feet downstream, obtained by East Kauai Water Co. Extremes.- Maximum discharge during year, 23.6 million gallons a day (36.5 second-feet) Feb. 1 (gage height, 2.66 feet); minimum, 0.03 million gallons a day (0.05 second- foot) Feb. 19, 20. 1936-38: Maximum discharge, that of Feb. 1, 1938; minimum, 0.03 million gallons a day (0.05 second-foot) on several days in November and December 1936 and January 1937 and February 19, 20, 1938. Remarks.- Records good. Ditch diverts water from Makaleha Stream for irrigation of sugarcane. Flow regulated by gates at intake and wasteway 1 mile upstream.

Discharge, In million gallons, fiscal jeer July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 6.0 6.0 8.2 8.2 2.8 0.24 0.12 2.8 5.1 0.08 6.4 11.8 2 6.4 4.6 8.2 8.7 1.20 .22 .10 7.8 4.9 .06 6.4 5.9 3 7.8 .46 8.7 7.8 .76 3.45 .10 .36 5.2 .06 4.7 .99 4 7.8 .39 9.2 8.2 .57 5.6 .10 .30 5.1 .06 3.8 .76 5 2.75 2.85 S.2 7.8 .46 5.6 .10 .14 6.0 2.65 3.75 .64 6 .30 4.8 8.2 8.2 .36 4.5 .10 .12 6.9 7.4 3.6 5.6 7 54 4.5 7.4 7.8 .30 4.4 1.17 .10 8.0 6.9 3.75 7.8 8 .50 4.5 6.0 8.2 .27 4.5 6.4 .OS 4.2 4.8 3.75 6.4 9 .84 4.5 6.0 8.2 .24 4.4 6.4 .08 .14 4.2 3.65 7.4 10 2.65 5.2 6.0 7.8 .33 4.8 5.2 .08 .10 4.2 3.6 S.O 11 6.0 6.0 6.0 7.8 .30 6.4 5.2 .08 .10 4.0 3.5 2.55 12 6.0 6.0 6.4 7.8 .19 6.4 4.4 .30 .10 1.11 3.5 1.16 13 6.0 6.0 6.0 7.8 .19 6.4 6.4 .10 .10 .93 3.65 .93 14 6.0 6.4 6.9 7.8 .17 6.0 6.4 .08 .10 .80 3.4 .84 15 6.0 6.4 7.4 7.8 .19 6.4 6.4 .06 .10 .65 3.15 .72 16 6.4 6.9 7.4 5.0 4.0 6.9 6.0 .06 .OS .50 3.1 4.3 17 5.4 5.5 7.8 4.4 6.0 6.4 6.0 .05 .08 .39 5.2 6.0 18 .97 .17 7.4 3.7 6.0 5.6 6.0 .05 .OS 4.0 6.0 4.2 19 34 .14 7.4 .36 6.0 6.0 5.2 .05 .08 6.9 6.0 .80 20 .88 .12 6.0 .27 4.5 5.1 6.0 .05 .08 6.0 6.0 1.20 31 .80 .12 6.0 .24 6.0 4.9 2.55 .05 .08 4.3 6.4 .93 32 2.1 .10 6.4 .19 4.7 6.4 2.65 .05 .10 1.40 6.0 4.4 33 6.0 .10 9 .2 .17 4.7 6.9 8.2 .06 .12 1.30 5.6 6.0 24 6.0 .10 12.4 .22 4.8 11.3 9.2 2.5 .12 1.20 5.2 6.3 25 6.4 3.4 12.4 .22 8.2 9.2 6.9 6.4 .14 1.16 8.7 6.0 26 6.4 6.4 11.8 .17 2.9 7.4 7.4 6.0 .25 4.7 8.7 6.9 27 6.4 8.7 12.9 4.0 .57 5.5 9.7 6.0 .14 6.0 6.4 6.0 38 6.0 11.2 8.7 6.0 .50 .61 13.2 5.6 .12 6.0 6.4 6.9 29 6.0 9.7 6.0 7.4 .36 .12 10.7 .12 6.0 6.9 8.7 30 6.0 9.2 8.2 2.6 .30 .12 1.93 .10 6.0 6.4 10.2 31 6.0 8.7 1.52 .14 1.16 .10 8.2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 7.8 0.24 4.43 6.85 137 422 Augi 11.2 .10 4.49 6.95 139 427 Sep 12.9 6.0 7.96 12.3 239 733 Oct 8.7 .17 5.04 7.80 156 480 HOT 8.2 .17 2.26 3.50 67.9 208 Dec 11.3 .12 4.90 7.58 152 466 0 alendar year 192 12.9 .03 3.26 5.04 1,190 3,660 Jan 13.2 .10 4.88 7.55 151 465 Feb 7.8 .05 1.41 2.18 39.4 121 Mar 8.0 .08 1.55 2.40 47.9 147 Apr 7.4 .06 3.12 4.83 93.8 288 May 8.7 3.L 5.22 8.08 162 497 Jun 11. S .64 4.68 7.24 140 431 F lacal year 1937- 38 ...... 13.2 .05 4.18 6.47 1,580 4,680 26 ISLAND OF KAUAI

Anahola River near Kealla Location.- Concrete dam and orifice control, lat. 22°08'55", long. 159°21'20", Just up­ stream from Intake of Lower Anahola ditch, 44 miles northwest of Kealla. Altitude. 220 feet, by barometer. Drainage area.- 5.5 square miles. Records available.- August to November 1910, December 1912 to June 1938. Average discharge.- 19 years (1919-38), 13.6 million gallons a day (21.0 second-feet). Extremes.- Maximum discharge during year, 2,130 million gallons a day (3,300 second-feet) Feb. 2 (gage height, 6.33 feet), from rating curve extended above 230 million gallons a day; minimum, 2.65 million gallons a day (4.10 second-feet) Dec. 19. 1910, 1912-38: Maximum discharge, 3,580 million gallons a day (5,540 second-fee't) Mar. 19, 1937 (gage height, 7.72 feet), from rating curve extended above 300 million gallons a day; minimum, 1.4 million gallons a day (2.2 second-feet) Sept. 12, 13, 1983. Remarks.- Records excellent except those for periods of missing gage heights, July 1, 2, Mar. 8-11 (computed on basis of records for stations on nearby streams) and those above 300 million gallons a day, which are fair. Anahola ditch diverts water 3 miles above station for Irrigation in vicinity of Kealla.

Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge gallons a day) July 1 to Aug. 17 Aug. 18 to June 30 0.9 2.85 1.4 7.1 2.2 50 0.9 2.00 11.5 3.0 162 1.1 4.3 1.45 7.7 2.5 81 1.0 2.55 22 3.5 2S2 1.25 5.6 1.5 8.5 2.9 143 1.2 34.5 4.0 456 1.3 6.0 1.7 16.5 3.4 254 1.4 6.1 4.5 692 1.35 6.6 1.9 28 1.5 8.0

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 4.1 13.6 6.6 8.0 83 3.65 11.5 80 5.8 70 7.8 55 2 4.2 12.9 5.7 10.8 29.5 3.65 8.6 506 5.3 24.5 8.0 28.5 3 5.3 13.9 6.2 4.4 17.0 3.5 7.4 68 4.9 22 14.4 14.0 4 21 8.3 13.5 14.3 14.0 3.45 6.4 43 4.8 16.0 11.5 10.2 5 7.9 8.0 6.8 6.1 11.5 3.4 5.4 31.5 15.2 15.0 7.4 8.5 6 11.1 8.8 7.2 5.3 9.1 3.3 4.9 21 7.4 30.5 6.5 7.6 7 8.3 7.2 8.2 5.2 8.5 3.25 5.2 17.6 398 12.5 7.2 7.2 8 5.6 6.6 6.8 12.7 7.4 3.15 49 15.0 100 11.0 8.0 6.6 9 6.8 6.3 5.3 8.2 7.0 3.1 10.6 13.0 40 21.5 7.8 6.6 10 5.4 6.1 4.8 4.9 7.0 3.05 7.6 12.0 15-0 42 8.8 59 11 4.7 5.9 6.1 4.8 6.6 2.95 6.6 27.5 14.0 35 6.8 74 12 4.9 6.6 9.1 5.3 6.0 3.05 6.0 162 26 12.5 7.8 16.5 13 5.0 5.9 5.2 4.6 5.7 2.9 5.7 36 29.5 10.6 12.3 10.6 14 4.6 5.8 4.4 4.7 5.3 2.9 5.1 21 55 12.5 8.4 11.7 15 4.8 13.9 4.1 5.2 5.1 2 9 4.7 16.0 29.5 11.5 6.2 15.2 16 9.8 57 4.2 3.8 3.8 2.9 4.4 13.5 19.8 9.4 5.8 10.6 17 62 162 4.4 9.6 4.6 2.75 4.0 12.0 15.5 14.6 5.4 12.5 18 7.6 14 3.8 47 4.4 2.75 3.8 11.0 15.0 9.4 5.1 10.2 19 7.1 9.4 4.0 6.6 4.2 2.7 3.75 9.8 13.0 66 4.7 8.2 20 9.1 8.2 3.8 5.2 4.0 3.0 4.1 9.1 13.5 11.5 4.7 21.5 21 7.7 8.2 3.75 4.7 3.9 3.15 6.5 8.5 10.6 9.1 14.4 10.6 22 6.9 9.8 3.6 9.3 3.65 2.75 4.1 8.0 9.4 8.2 5.4 8.2 23 7.2 8.2 4.7 7.9 3.5 10.1 9.8 7.8 8.8 7.8 4.6 7.4 24 5.9 7.8 5.2 18.4 3.5 24.5 7.2 7.4 8.2 7.6 4.3 7.0 25 25 7.0 7.8 9.1 89 22.5 4.3 6.8 10.2 7.6 17.6 7.2 26 19.8 8.8 7.6 6.1 7.4 12.0 4.1 6.6 111 9.8 47 6.6 27 11.1 7.6 10.1 5.2 7.0 45 3.8 6.2 46 7.2 10.6 6.0 28 7.7 7.0 18.4 6.2 5.1 46 102 6.0 18.2 6.6 10.4 5.7 29 7.7 57 4.9 104 4.2 16.5 110 19.3 6.2 11.3 6.6 30 9.1 14.0 13.6 21.5 3,9 17.6 24 48 7-6 9.8 9.1 31 7.4 7.8 63 21.5 13.5 94 9.8

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 62 4.1 10.2 15.8 315 966 Augi 162 5.8 16.9 26.1 524 1,610 Sep 18.4 3.6 6.67 10.3 200 614 Oct 104 3.8 13.9 21.5 432 1,330 Hoy 89 3.5 12.5 19.3 376 1,150 Dec 46 2.7 9.16 14.2 284 872 0 alendar year 193 577 2.7 19.8 30.6 7,240 22,220 Jan 110 3.75 14.6 22.6 454 1,390 Feb 506 6.0 42.2 65.3 1,180 3,630 Mar 398 4.8 39.1 60.5 1,210 3,720 Apr 70 6.2 17.9 27.7 536 1,640 May 47 4.3 9.67 15.0 300 920 Jun 74 5.7 15.6 24.1 469 1,440 Fiacal year 1937- 506 2.7 17.2 26.6 6,280 19,280 ISLAND OF KAUAI

Anahola ditch above Kaneha Reservoir, near Kealia

Location.- Parshall flume, lat. 22°08'00", long. 159°22'30", at point of discharge into Kaneha Reservoir, 5 miles northwest of Kealia. Altitude, 831 feet, by levels from Lihue Plantation bench mark. Records available.- May 1915 to June 1938. Average discharge.- 15 years (1921-25, 1927-38), 3.39 million gallons a day (5.25 second- feet). Extremes.- Maximum discharge during year, 51 million gallons a day (79 second-feet) Jan. 28 (gage height, 2.73 feet); no flow Feb. 15-17. 1915-38: Maximum discharge recorded, 130 million gallons a day (201 second-feet) Jan. 16, 1921 (gage height, 6.25 feet, former site and datum); no flow occasionally, when water was shut out of ditch. Remarks.- Records good. Ditch diverts water from Anahola River to Kaneha Reservoir, where it is stored for irrigation. Flow regulated by wasteway gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 1.65 0.04 4.1 0,06 0.04 0.02 0.04 0.38 1.92 0.04 4.1 2.55 2 1.65 .04 3.8 .08 .02 .02 .04 2.2 1.74 .02 9.5 .04 3 4.3 .04 3.35 1.53 .02 .01 .04 .04 1.65 .02 4.7 .04 4 12.4 .04 1.35 3.2 .02 .01 .04 .02 1.57 .02 .04 .06 5 11.6 5.6 .06 .06 .04 .01 .04 .02 3.0 .02 .04 3.55 6 15.2 3.2 3.0 .06 .06 1.26 .04 .02 1.74 .04 .02 4.3 7 11.8 .06 1.50 2.7 .06 1.57 .04 .04 6.4 .04 .04 3.7 8 4.4 2.85 4.4 9.5 .06 1.49 .06 .02 .12 .02 .04 3.45 9 9.3 4.3 3.8 3.5 .04 1.41 .02 .02 .02 .04 .04 6.0 10 4.2 3.7 3.35 .02 .04 1.33 .02 .04 .02 .OS .04 4.3 11 3.15 4.0 4.8 2.5 .04 1.25 .02 .04 .12 .04 .04 .13 12 4.2 6.0 6.1 3.6 .04 1.49 .02 .05 .04 .04 .04 .06 13 3.95 3.45 1.36 3.35 .02 1.33 .68 .02 .04 .04 .06 .06 14 3.05 4.5 3.05 3.9 .04 1.25 1.92 .02 .04 .04 .04 .04 15 4.9 9.9 2.7 6.0 .04 1.41 1.74 .01 .04 .02 .04 3.8 16 13.7 .04 3.25 3.45 1.93 1.41 1.65 .01 .04 .02 .04 6.4 17 6.3 .62 2.95 9.7 2.5 1.25 1.57 .01 .04 .02 .04 3.5 18 3.35 .04 2.5 5.5 2.3 1.25 1.49 .02 .02 .02 2.15 1.40 19 7.1 .02 2.8 .02 2.1 1.18 1.49 .02 .02 .02 2.7 3.9 20 3.2 .02 2.4 .02 2.0 1.25 2.15 .02 .04 .02 2.75 2.2 21 .04 .02 2.3 .02 1.92 1.41 1.74 .02 .04 .02 12.1 .04 22 .04 .04 3.15 .02 1.83 1.18 1.41 .02 .02 .02 3.6 3.05 23 4.2 .04 4.8 .02 1.74 6.4 8.0 .02 .02 .02 2.95 3.7 24 5.4 1.71 7.4 .02 5.4 14.8 3.8 .04 .02 .02 2.6 3.25 25 4.0 3.7 7.6 .02 7.6 4.4 1.83 1.28 .02 .02 12.2 3.15 26 .06 5.8 6.8 .01 .02 .4 2.0 2.0 .08 .02 8.7 2.95 27 .04 4.8 8.2 .01 .01 3.0 5.5 1.92 .06 .02 4.9 2.7 28 .04 7.3 4.1 .01 .02 .35 9.9 1.83 .04 .02 8.1 2.6 29 5.2 5.6 2.0 .02 .02 .13 .13 .04 .02 2.9 3.6 30 1.80 .04 5.3 .02 .02 .10 .04 .06 .02 9.4 6.8 31 .06 1.54 .04 .OS .02 .08 3.7

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 15.2 0.04 4.78 7.40 148 455 Augi 9.9 .02 2.55 3.95 79.0 243 Sep 8.2 .06 3.74 5.79 112 345 Oct 9.7 .01 1.90 2.94 59.0 181 Hov 7.6 .01 1.00 1.55 30.0 92 Dec 14.8 .01 1.69 2.61 52.4 161 C alendar year 19S 15. 2 0 1.74 2.69 635 1,950 Jan 9.9 .02 1.53 2.37 47.5 146 Peb 2.2 .01 .362 .560 10.2 31 Mar 6.4 .02 .616 .953 19.1 59 Apr .08 .02 .027 .042 .82 2.5 May 12.2 .02 3.15 4.87 97.6 300 Jun 6.8 .04 2.71 4.19 81.4 250 P Iscal year 1937- 15.2 .01 2.02 3.13 737 2,270 28 ISLAND OF KAUAI

Anahola ditch wasteway near Kealia

Location.- Sharp-crested weir, lat. 22°08'10", long. 159°22'30", 300 feet downstream from wasteway gates on Anahola ditch, 500 feet upstream from Kaneha Reservoir. 3.8 miles west of Anahola, and 4.9 northwest of Kealia. Records available.- December 1936 to June 1938. Extremes.- Maximum discharge during year, 88 million gallons a day (136 second-feet) Feb. 2 (gage height, 2.60 feet); no now on several days during year. 1936-38: Maximum discharge, that of Feb. 2, 1938; no flow at times when water was turned out of ditch. Remarks.- Records good except those for period of faulty gage heights, Dec. 27-31, which were computed on basis of records for stations on nearby ditches and streams and are poor. Water that passes station is returned to Anahola River.

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. ' Nov. Dec. Jan. Peb. Mar. Apr. May June

1 0.02 11.9 0.22 5.0 26 2.8 7.5 14.9 0.43 18.9 2.65 18.7 2 .02 13.8 .19 11.0 15.5 2.8 5.7 37 .43 9,8 .26 18.7 3 .02 13.9 3.0 3.0 11.3 2.15 4.4 18.3 .43 11.3 9.8 9.9 4 .01 9.1 9.7 12.2 9.6 2.0 3.65 14.9 .38 6.S 14.2 7.0 5 0 1.50 4.8 5.0 9.4 2.0 3.3 10.?. .43 7.1 6.4 1.68 6 .02 5.2 3.65 5.2 7.0 .55 2.95 6.4 .34 14.8 5.0 .19 7 .02 5.2 6.4 1.58 6.4 .12 3.25 6.2 12.1 6.8 7.5 .19 8 0 1.40 2.5 .19 4.8 .12 14.8 5.1 27.5 6.5 9 2 .19 9 .01 .19 .19 3.2 5.2 .12 4.8 5.8 12.6 12.4 10)7 .19 10 0 .19 .12 3.85 5.2 .12 3.5 5.4 8.2 26 10.5 15.9 11 0 .19 .12 .91 5.2 .12 2.95 17.4 6.5 21.5 6.4 24 12 0 .19 5.7 .19 3.85 .12 2.8 2S.5 18.6 10.5 8.7 9.8 13 0 .12 2.55 .26 3.5 .12 1.90 13.4 19.8 8.0 11.4 6.2 14 0 .19 .19 .26 3.5 .19 .19 7.1 24.5 12.5 6.1 12.1 15 0 2.0 .12 .19 3.3 .19 .19 5.9 17.6 9.4 5.4 6.4 16 .02 18.5 .12 .12 1.22 .19 .19 5.0 11.3 7.2 4.2 .26 17 13.0 24 .19 .19 .52 .19 .19 4.4 7.0 11.2 3.85 6.8 18 2.6 8.9 .19 8.0 .52 .19 .19 4. S 10.1 7.0 1.04 6.0 19 .19 6.2 .19 4.2 .48 .19 .19 3.85 7.7 18.9 .26 1.34 20 7.1 5.2 .19 3.5 .52 .19 .19 3.65 8.7 8.0 .19 10.1 21 8.9 5.5 .19 4.8 .62 .19 .19 3.5 5.9 5.8 .12 5.8 22 5.8 4.8 .19 10.4 .62 .19 .19 3.15 5.0 4.9 .07 1.09 23 1.75 4.6 .19 4.3 .73 .26 .26 2.95 4.5 4.4 .07 .10 24 .19 2.3 .19 21 .73 .19 .19 2.8 4.1 4.D .07 .07 25 14.7 .19 .19 17.8 15.3 10.3 .19 1.19 12.2 4.0 .12 .07 26 18.2 .19 .19 14.7 6.3 14.4 .19 .34 18.2 9.2 13.2 .10 27 14.2 .19 .19 13.9 7.5 12 .19 .43 19.7 4.1 2.85 .07 28 6.6 .26 15.5 15.1 4.4 13 11.0 .43 8.3 3.5 4.6 .07 29 4.6 17.4 10.6 26 3.85 8.0 26 9.3 3.5 10.5 .10 30 9.0 9.8 7.2 17.6 3.15 7.0 12.8 19.8 5.8 3.15 .10 31 8.3 4. S 26 10 10.3 26 7.8

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 18.2 0 3.72 5.76 115 354 Augi 24 .12 5,72 8.85 177 544 Sep 15.5 .12 2.50 3.87 75.0 230 Oct 26 .12 7.73 12.0 240 735 Hov 26 .48 5.54 8.57 166 510 Dec 14.4 .12 2.90 4.49 90.0 276 C alendar year 193 36.5 0 6.35 9.82 2,320 7,110 Jan 26 .19 4.01 6.20 124 382 Peb 37 .34 8.30 12.8 232 713 Mar 27.5 .34 10.6 16.4 388 1,010 Apr 26 3.5 9.46 14.6 284 871 May 14.2 .07 5.36 8.29 166 510 Jun 24 .07 5.44 8.42 163 501 F Iscal year 1937- 37 0 5.92 9.16 2,160 6,640 ISLAND OF KAUAI 29

Lower Anahola ditch near Kealia

Location.- Parshall flume, lat. 22°08'00", long. 159°19'30", 100 feet downstream from last wasteway, 1.3 miles southwest of mouth of Anahola River, and 2.5 miles north­ west of Kealia. Altitude, 271± 5 feet, by levels from approximate site of two demolished Geological Survey bench marks. Records available.- December 1936 to June 1938. Records obtained by East Kauai Water Co. July 1925 to January 1935 at site half a mile downstream and January 1935 to December 1936 at present site. Extremes.- Maximum discharge during year, 14.2 million gallons a day (22.0 second-feet) June 15 (gage height, 1.92 feet); no flow at times, when water was turned out of ditch. 1936-38: Maximum discharge, 16.5 million gallons a day (25.5 second-feet) Apr. 19, 1937 (gage height, 2.11 feet); no flow at times when water was turned out of ditch. Remarks.- Records excellent, Water used for irrigation of sugarcane. Flow regulated by spillways and gates.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June 1 5.1 1.88 5.4 8.5 0 0 0 0 3.85 0.95 9 2 12.0 2 5.0 2.45 5.2 5.3 0 0 0 .57 6.4 .86 6 9 6.6 3 5.6 0 5.9 0 0 0 0 0 7.4 .01 6 6 0 4 1.51 0 4.2 2.65 0 0 0 0 6.9 2.0 2 95 6.5 5 2.85 2.25 0 4.7 0 0 0 0 7.4 4.7 3 55 6.0 6 3.95 5.8 4.5 5.6 0 2.75 3.05 0 7.8 7.4 4 2 6.9 7 4.5 3.75 6.0 5.6 0 3.75 3.8 0 6.1 7.S 4 3 6.9 8 5.2 1.8S 6.0 4.7 0 4.1 2.6 0 2.65 8.3 4 6 6.9 9 6.2 4.3 6.0 3.0 0 4.2 0 0 0 4.7 5 6 6.9 10 3.5 4.5 6.0 0 *1.60 3.95 2.7 0 0 3.6 5 1 3.75 11 2.35 5.2 3.65 .85 *0 3.8 5.2 0 0 1.29 6 4 0 12 5.6 6.0 .01 .5 *2.45 3.75 6.9 0 0 1.01 9 7 0 13 5.6 5.9 3.05 .3 2 3.75 6.9 0 0 .01 11 5 0 14 5.2 3.35 5,0 .2 0 3.6 5.6 0 0 .18 7 7 6.6 15 5.2 2.55 5.6 .4 1.31 3.6 5.6 0 0 .01 3 45 8.7 16 6.6 6.9 5.6 2.45 2.9 3.5 5.2 0 1.68 .01 6 4 2.6 17 3.7 1.53 5.6 .01 3.9 3.25 4.9 0 1.68 .01 7 4 3.2 18 1.63 .01 5.2 2.4 4.9 3.4 4.8 0 1.01 2.6 7 8 5.2 19 4.2 0 5.2 0 4.8 3.15 4.7 0 .94 4.2 6 4 5.6 20 4.3 0 5.0 0 4.7 3.6 5.8 0 0 4.5 6 6 7.4 21 3.8 0 4.9 1.59 4.6 3.95 6.0 0 .98 4.8 7 4 9.2 22 3.65 4 4.7 3.35 4.5 3.4 5.1 0 0 4.9 6 9 7.8 23 3.45 6 5.2 2.1 4.3 3.65 5.2 .79 0 1.78 6 0 3.75 24 1.38 6 5.5 0 4.3 6.6 5.6 0 0 .01 6 0 0 25 0 5.7 6.0 1.69 6.9 6.9 5.0 1.68 0 3.8 6 4 4.3 26 0 6.0 6.0 2.4 2.75 2.75 4.8 1.63 1.96 1.92 10 2 6.0 27 0 6.4 6.4 2.2 0 1.60 4.5 0 0 2.8 10 5 6.0 28 2.35 6.4 7.8 2.1 0 n 2.6 1.98 0 4.6 7 4 6.4 29 5.6 3.55 8.2 1.08 0 0 0 0 7.4 11 8 6.4 30 5.4 4.0 6.9 0 0 0 0 0 9.7 10 2 6.0 31 3.05 5.6 0 0 0 0 9 7

Million gallons a day Second- Total run-off Month feet (mean) Million Haxlmum Minimum Mean gallons Acre-feet Jul 6.6 0 3.76 5.82 116 357 Augl 6.9 0 3.61 5,59 112 343 Sep 8.2 0 5.16 7.98 155 475 0

*Partly estimated. 220372 O 40 3 30 ISLAND OF KA.UAI

Ka Loko ditch near Kilauea

Location.- Parshall flume, lat. 22°10'35", long. 159°23'00", 60 feet downstream from junction of Ka Loko and Moloaa ditches, 400 feet upstream from Ka Loko reservoir, and 3s miles southeast of Kilauea. Altitude, 750 feet, from topographic map. Records available.- August 1932 to June 1938. Extremes.-Maximum discharge during year, 94 million gallons a day (146 second-feet) Mar. 7 (gage height, 4.05 feet); minimum, 0.63 million gallons a day (0.93 second- foot) Jan. 28. 1932-38: Maximum discharge, 108 million gallons a day (167 second-feet) Jan. £, 1933 (gage height, 4.41 feet); minimum, 0.19 million gallons a day (0.29 second-foot) May 24, 1933. Remarks.- Records excellent except those for periods when clock was not running, July 24-27, Apr. 24-29, May 24 to June 2, which were computed on basis of records for sta­ tions on nearby ditches and are poor. Ditch diverts water from Moloaa and Puu Ka Ele Streams, half a mile southeast and li miles southwest of station, respectively. Flow regulated by wasteway gates. Water used for irrigation in vicinity of Kilauea.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 1.63 5.1 2.95 3.05 20.5 2.15 4.6 9.6 2.55 4.9 3.7 8.0 2 1.54 8.8 2.75 3.45 10,5 2.15 3.45 21.5 2.45 1.54 5.0 9.0 3 2.05 6.7 3.25 2.25 6.6 2.05 3.05 6.5 2.25 1.63 8.1 7.5 4 4.5 4.6 5.0 6.4 6.3 1.98 42.75 6.1 2.35 3.85 5.8 4.4 5 3.5 4.1 3.15 3.05 6.2 1.98 42.45 5.1 5.9 5.0 3.45 3.8 6 5.4 4.8 3.55 3.8 4.9 1.89 2.35 4.7 3.3 5.8 3.05 3.35 7 4.1 3.35 3.55 3.05 4.5 1.80 2.6 4.7 33.5 4.5 3.35 3.25 8 2.25 2.95 2.75 6.3 3.9 1.71 16.1 4.7 13.9 4.3 3.55 3.15 9 2.35 3.05 2.45 4.3 3.7 1.71 4.3 4.5 1.80 6.2 3.05 3.05 10 1.98 2.75 2.35 2.75 3.7 1.63 2.95 4.4 2.0 8.5 3.55 10.6 11 1.8 2.75 2.65 2.65 3.35 1.54 2.55 4.5 2.85 7.3 3.05 22 12 1.89 3.85 4.2 2.95 3.15 1.80 2.35 10.6 4.5 4.9 3.7 6.3 13 2.05 2.85 2.45 2.75 2.95 1.63 2.35 3.0 5.0 4.6 5.2 4.4 14 1.98 2.95 2.25 2.75 2.85 1.71 2.15 3.8 4.B 4.9 3.7 4.4 15 2.6 4.1 2.15 2.95 2.75 1.71 2.05 4.6 1.98 5.1 2.95 5.1 16 6.4 9.8 2.25 2.35 2,65 1.53 1 98 4.3 2.5 4.3 2.85 4.1 17 15.2 20.5 2.25 2.8 2.55 1.54 l'.98 3.9 2.75 4.4 2.75 4.5 18 3.55 4.7 2.05 10.2 2.45 1.54 1.89 4.0 2.75 3.8 2.55 3.8 19 2.75 3.3 2.05 2.75 2.45 1.47 1.80 3.55 2.35 9.2 2.35 3.45 20 3.75 3.45 2.05 2.45 2.45 1.71 1.89 3.45 2.6 4.4 2.35 8.4 21 3.45 3.7 2.05 2.15 2.35 1.80 2.05 3.35 2.25 3.35 4.8 4.0 22 3.35 3.9 2.05 4.8 2.15 1.54 1.89 3.05 1.98 3.35 2.55 3.25 23 3.95 3.55 2.65 3.55 2.15 3.55 3.05 1.98 3.15 2.25 2.95 24 3.0 3.35 2.85 5.4 2.55 s',3 2.95 2,95 1.89 3.1 2.2 2.75 25 5.3 2.95 3.7 3.35 10.6 11.4 2.05 2,85 2.25 3.0 4.5 3.05 26 4.0 3.45 4.0 2.55 3.8 5.7 1.98 2.65 12.6 4.0 9.0 2.65 27 3.5 3.05 4.3 2.35 3.9 12.6 1.98 2.55 11.4 3.0 4.0 2.55 28 2.95 3.15 3.95 2.3 2.95 11.7 10.4 2.45 1.80 2.9 4.5 2.45 29 2.95 7.4 2.25 19.0 2.65 5.6 23.5 1.50 3.0 4.3 2.95 30 4.0 7.0 4.4 9.1 2.35 6.6 7.7 3.05 3.9 3.9 3.8 31 3.1 3.8 12.3 8.3 3.8 5.3 4.5

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 15.2 1.54 3.57 5.52 111 340 Augi 20.5 2.75 4.83 7.47 150 459 Sep 5.0 2.05 2.94 4.55 88.3 271 Oct 19.0 2.15 4.53 7.01 140 431 NOT 20.5 2.15 4.46 6.90 134 411 Dec 12.6 1.47 3.59 5.55 111 341 C alendar year 193 38 1.02 4.33 6.70 1,580 4,850 Jan 23.5 1.80 4.11 6.36 127 391 Pet) 21 5 2.45 5.01 7.75 140 431 Mar 33.5 1.50 4.78 7.40 148 454 Apr 9.2 1.54 4.40 6.81 132 405 May 9.0 2.2 3.89 6.02 121 370 Jun 22 2.45 5.10 7.89 153 469 Fiscal year 1937- 33.5 1.47 4.26 6.59 1,560 4,770

*Partly estimated. ISLAND OF KAUAI 31

Puu Ka Ele ditch near Kllauea

Location.- Parshall flume, lat. 22°11'05", long. 159°24'20", 100 feet upstream from Puu Ka Ele Reservoir and 2 miles south of Kilauea. Altitude, 430 feet, by barometer. Records available.- August 1932 to June 1938. Extremes.- Maximum discharge during year, 32.5 million gallons a day (50.3 second-feet) Har. 7 (gage height, 2.06 feet); no flow during several periods In year. 1932-38: Maximum discharge, that of Mar. 7, 1938; no flow occasionally, when water was shut out of ditch. Remarks.- Records excellent except those for periods when clock was not running, Sept. 21-25, Oct. 17, Oct. 25 to Nov. 4, Nov. 13-15, Dec. 4-9, 23-26, 29-31, Jan. 1-4, Mar. 21 to Apr. 18, which were computed on basis of records for stations on Ka Loko and Kallhlwal ditches and are poor. Ditch diverts water from Puu Ka Ele Stream 1 mile southwest of station. Flow regulated by wasteway gate 100 feet above station. No diversion. Water used for Irrigation In vicinity of Kllauea.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 2.25 5.8 4.1 4.0 0 2.85 3.3 7.6 3.05 4.5 4.0 11.4 2 2.25 11.6 3.85 4.9 0 2.85 3.1 3.9 2.95 2.0 6.0 13.8 3 2.75 10.7 4.2 3.45 0 2.75 3.1 .41 2.85 2.1 7.9 11.2 4 5.3 6.7 5.8 4.3 0 2.6 3.1 .31 2.85 4.5 6.6 3.75 5 4.4 6.3 3.8 2.5 0 2.4 #3.05 .07 3.45 5.6 4.3 3.55 6 5.6 7.4 4.3 4.5 .87 2.3 2.95 0 3.05 6.2 3.8 4.5 7 4.7 4.9 4.1 3.55 0 2.2 3.1 0 5.5 5.0 4.0 4.0 8 3.05 4.3 3.55 3.3 .12 2.0 3.75 0 1.79 4.5 4.0 3.8 9 3.05 4.1 3.25 .09 .85 1.9 .44 0 .30 6.0 3.45 3.65 10 2.75 3.8 3.25 2.3 .67 1.52 3.85 0 0 8.0 3.45 7.1 11 2.55 3.7 3.35 3.25 .23 2.15 3.35 .13 0 7.0 3.25 1.05 12 2.65 4.1 5.4 3.35 .16 2.35 3.25 1.4 .48 6.6 3.55 4.4 13 3.05 s'.s 3.35 3.15 .1 2.45 2.0 .32 .76 5.2 6.0 5.0 14 2.95 2.95 3.15 1.5 2.25 0 2.85 1.14 5.4 3.9 5.0 15 3.45 4.3 2.85 3.35 2.8 2.05 2.1 6.3 .54 5.6 3.15 5.6 16 8.9 11.1 2.85 2.85 *2.85 1.98 2.95 5.5 .12 5.0 3.15 4.5 17 14.0 4.7 2.75 3.5 2.85 1.98 2.85 3.15 .68 5.2 2.95 4.34.5 ' 18 5.6 4.4 2.65 #7.0 2.75 2.25 2.75 0 .08 4.5 2.85 19 4.4 4.9 2.55 3.35 2.55 2.25 2.65 3.1 0 #6.6 2.75 3.8 20 5.6 4.5 #2.55 2.95 2.45 2.05 2.65 4.0 .04 4.9 2.65 4.6 21 4.6 4.5 2.5 2.85 2.45 2.75 2.55 3.9 .02 4.3 5.2 3.4 22 5.2 4.7 2.5 .74 2.25 6.7 2.45 3.7 0 2.95 3.55 23 6.0 4.5 2.8 0 2.25 5.0 3.15 3.55 0 3°.8 2.65 3.35 24 3.9 4.0 3.0 .03 2.95 6.0 2.85 . 3.45 0 3.55 2.55 3.15 25 9.1 3.7 3.5 .03 11.7 6.2 2.45 3.35 1.5 3.45 5.2 3.25 26 6.5 3.9 3.55 .03 4.5 4.5 2.55 3.15 9.0 4.6 11.6 2.95 27 5.7 3.55 4.1 .03 5.0 *8.0 2.65 3.15 8.0 3.35 4.6 2.85 28 4.3 4.3 2.7 .03 3.35 *6.7 3.55 2.95 2.5 3.25 5.4 2.75 29 4.1 9.5 2.4 .4 3.15 3.5 2.65 2.0 3.35 5.0 2.95 30 5.5 10.9 5.1 .15 2.85 3.3 .32 3.5 3.8 4.3 3.65 31 4.0 5.5 0 3.5 4.0 5.0 5.1

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 14.0 2.25 4.78 7.40 148 455 Aug 11.6 3.55 5.61 8.68 174 534 Sep 5.8 2.4 3.45 5.34 104 318 Oct 7.0 0 2.36 3.65 73.1 224 Nov 11.7 0 2.02 3.13 60.6 186 Dec 8.0 1.52 3.27 5.06 101 311 Calendar year 193 14.0 0 3.00 4.64 1,100 3,360 Jan 4.0 0 2.69 4.16 83.5 256 Peb 7.6 0 2.37 3.67 66.2 203 Hal- 9.0 0 1.97 3.05 61.2 188 Apr 8.0 2.0 4.72 7.30 142 435 May 11.6 2.55 4.40 6.81 136 418 Jun 13.8 1.05 4.71 7.29 141 434 PIscal year 3937- 14.0 0 3.54 5.48 1,290 3,960

#Partly estimated. 32 ISLAND OF KAUAI

Kalihiwai ditch near Kilauea

Location.- Parshall flume, lat. 22°10'55", long. 159°25'55", 0.1 mile upstream from Kalihiwai Reservoir and 2.4 miles southwest of Kilauea. Altitude, 410 feet, by barometer. Records available.- June 1934 to June 1938. Extremes.- Maximum discharge recorded during year, 64 million gallons a day (99 second- feet)Mar. 7 (gage height, 3.17 feet); minimum discharge not determined, owing to faulty record. 1934-38: Maximum discharge, that of Mar. 7, 1938; minimum, 0.01 million gallons a day (0.02 second-foot) Nov. 28, Dec. 4, 1934. Remarks.- Records good except those for periods when clock was not running, Jan. 5-18, 27, 28, Mar. 20-31, Apr. 4-20, May 6-31, June l,-9, 10, 12-17, 21-30, which were computed on basis of records for stations on nearby ditches and are poor. Ditch diverts low-water flow from most branches of Pohakuhonu Stream at intakes, about 1 mile south of station. Diversion of flow to Kahililolo Stream, 0.1 mile above station, regulated by gates. Water discharges into Kalihiwai Reservoir, where it is stored for irrigation in vicinity of Kilauea. Discharge, In million gallons, fiscal year July 1937 to June 1936

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 2.35 10.1 0.78 4.6 1.31 3.45 0.63 6.7 3.25 «0.68 4.3 3.0 2 2. 36 21 .68 4.5 .88 3.45 .57 7.9 3.05 .63 6.4 #1.39 3 3.15 13.2 .68 .68 .52 3.35 .52 1.31 2.95 2.5 4.4 1.31 4 8.3 1.23 .75 .68 .41 3.25 .49 2,3 2.95 3.0 1.02 2.05 5 8.6 7.7 .63 3.4 .63 3.15 .45 1.16 2.95 4.5 .95 2.15 6 13.3 11.1 .57 5.8 .52 3.05 .40 1.02 2.75 5.4 .90 3.15 7 8.0 4.7 .57 3.1 .32 2.95 .45 .96 12.5 4.0 1.0 4.3 8 4.6 2.35 .49 4.2 .27 2.85 3.5 1.82 1.02 4.0 1.1 3.9 9 8.6 2.15 .41 2.65 .32 2.75 3.0 4.2 4.5 6.0 .90 3.8 10 4.7 2.05 2.3 1.80 .32 2.75 2.5 3.35 3.65 7.0 1.0 5.0 11 3.8 1.98 3.9 1.54 .27 2.65 2.2 2.4 1.71 6.0 .90 #1.23 12 3.8 1.98 6.2 1.47 .23 2.75 2.1 2.05 3.05 4.5 3.5 1.2 13 4.9 1.89 3.8 1.47 .23 2.65 2.0 1.47 2.7 4.0 4.5 1.1 14 4.1 2.75 3.45 1.39 2.65 2.65 1.9 1.23 1.47 4.5 3.5 1.0 15 6.2 2.3 3.25 1.89 4.0 2.65 1.8 1.23 .63 5.0 3.3 1.1 16 29.5 2.95 3.15 1.37 3.9 2.55 1.7 1.94 .52 4.0 3.3 1.5 17 14.7 1.47 3.05 1.50 3.8 2.45 1.7 4.6 .52 4.0 3.2 3.0 18 4.9 .95 2.95 4.1 3.55 2.45 .50 2.6 .63 3.5 3.1 5.2 19 6.8 .75 3.05 1.63 3.45 2.45 .09 3.55 .57 7.0 3.0 3.1 20 8.7 .68 2.85 1.39 3.35 2.85 1.56 4.4 .60 5.4 2.9 1.98 21 8.1 .57 2.85 1.16 3.25 2.85 2.45 4.3 .56 4.7 5.6 1.9 22 8.3 .52 2.85 2.45 3.15 2.55 2.35 4.0 .54 2.9 3.5 1.8 23 8.4 1.62 3.95 2.25 2.95 1.5 2.45 2.8 .54 1.47 3.0 1.7 24 5.8 1.80 5.8 2.8 3.55 2.0 2.45 .68 .52 1.39 2 9 1.7 25 3.95 1.63 5.4 2.05 *10.7 2.2 2.45 .63 1.5 2.75 slo 1.7 26 1.16 1.71 3.55 1.47 3.25 1.2 2.75 1.23 7.0 3.3 10 1.6 27 2.6 1.63 3.35 1.31 3.35 1.6 1.7 1.80 6.0 2.6 4.5 1.5 28 4.7 2.05 12.1 1.23 3.45 1.5 3.5 2.7 .7 3.35 5.0 1.4 29 5.6 4.9 4.6 9.4 3.7 .95 5.5 .6 3.55 4.5 2.0 30 7.1 5.4 5.8 5.0 3.8 1.09 3.25 .8 4.0 3.5 4.0 31 5.8 2.3 3.25 .88 7.1 1.0 4.0

Million gallons a day Second- Total run-off Month feat (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 29.5 1.16 6.86 10.6 213 653 . Aiig 21 .52 3.79 5.86 117 360 Sep 12.1 .41 3.11 4.81 93.2 286 Oct 9.4 .68 2.63 4.07 81.5 250 HOT 10.7 .23 2.40 3.71 78.1 221 Dec 3.45 .88 2.43 3.76 75.4 231 C alendar year 193 29.5 .19 2.98 4.61 1,090 3,340 Jan 7.1 .09 2.06 3.19 64.0 196 Pet 7.9 .63 2.65 4.10 74.3 228 Mar 12.5 .52 2.31 3.57 71.7 220 Apr 7.0 .63 3.85 5.96 116 355 May 10 .90 3.38 5.23 105 321 Jun 5.2 1.0 2.33 3.61 69.8 214 P Iscal year 1937- 29.5 .09 3.16 4.89 1,150 3,540 Partly estimated. ISLAM) OF KAUAI 33

Hanalei River at altitude 625 feet, near Hanalei Location.- Lat. 22°07'10", long. 159°28'05", 0.4 mile downstream from confluence with Kaapoko Stream and 6i miles southeast of Hanalei. Altitude, 625 feet, from topographic map. Drainage area.- 7.4 square miles. Records available.- January 1914 to June 1938. Average discharge"!- 20 years (1918-38), 49.8 million gallons a day (77.1 second-feet). Extremes.- Maximum discharge during year, 2,320 million gallons a day (3,590 second-feet) Jan. 28 (gage height, 6.20 feet), from rating curve extended above 200 million gallons a day; minimum, 9.3 million gallons a day (14.4 second-feet) Oct.1 19, 21. 1914-38: Maximum discharge, 11,100 million gallons a day (17,200 second-feet) Mar. 19, 1937'(gage height, 10.52 feet), from rating curve extended above 200 million gallons a day; minimum, 5.8 million gallons a day (9.0 second-feet) Apr. 28, Hay 1-3, Remarks.- Records good except those for period when clock was not running, Feb. 6 to Mar. 19, which were computed on basis of records for stations on Kalalau, Hanakoa, and Hanakaplai Streams near Hanalei and are poor. Since 1925 Hanalei tunnel has been diverting an average of about 20 million gallons of water a day from Kaapoko Stream and Hanalei River, at points about 2 miles above station, for irrigation in vicinity of Lihue.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, in million gallons a day) 0.5 7.9 O.S 16.5 1.5 61 2.4 170 3.5 451 .6 1.0 26 l.S 2.7 227 .7 1.2 2.1 124 3.1 325

Discharge, In million gallons, fiscal year July 1937 to June 193S

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 9.7 46 19 22 149 16 28 47 100 78 27.5 201 2 10.5 115 18 96 67 15 24 211 40 33 49 130 3 16 117 19.5 26 37 14 21 77 20 38 49 60 4 53 55 29 41 42 13.5 18.5 59 17 24 79 33 5 31 36 23 22 69 12.5 16.5 40 16 115 28 26 6 61 41 27 23 60 12 15.5 25 15 115 21 23 7 84 25 32 19.5 47 12 15.5 20 60 35 28.5 22 8 24 22 24 39 36 11.5 21.5 18 200 30 34 21 9 54 21 18.5 22 52 11.5 15 16 80 69 34 30.5 10 26.5 19 17 18.5 33 11 13.5 16 7

Hllllon gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 101 9.7 38.2 59.1 1,180 3,630 Augi 410 19 53.6 82.9 1,660 5,100 Sep 187 11.5 24.9 38.5 747 2,290 Oob 187 13.5 36.6 56.6 1,140 3,480 HOT 352 13.5 45.6 70.6 1,370 4,300 Dec 194 9.5 32.2 49.8 998 3,060 C alendar year 192 1,290 9.5 52.1 80.6 19,030 58,370 Jan 329 9.7 41.1 63.6 1,280 3,910 Pete 211 10 31.1 48.1 870 2,670 Mar 287 15 82.9 128 2,570 7,890 Apr 330 12 52.8 81.7 1,580 4,860 May 100 14.5 33.1 51.2 1,030 3,150 Jun 201 15 44.2 68.4 1,320 4,060 PIscal year 1937- 410 9.5 43.1 66.7 15,740 48,300 34 ISLAND OF KAUAI

Hanakapiai Stream near Hanalei

Location.- Lat. 22°11'20", long. 159°35'50", 14 miles upstream from mouth and 6 miles west of Hanalei. Altitude, 450 feet, by barometer. Drainage area.- 2,6 square miles. Records available.- December 1931 to June 1938. Extremes.- Maximum discharge during year. 2,680 million gallons a day (4,150 second- feet] Dec. 23 (gage height, 8.41 feet), from rating curve extended above 60 million gallons a day; minimum, 4.0 million gallons a day (6.2 second-feet) Sept. 26. 1931-38: Maximum discharge, that of Dec. 23, 1937; minimum, 2.5 million gallons a day (3.9 second-feet) Jan. 16-19, Mar. 12, 13, 21, E2, 1934. Remarks.- Records good except those above 100 million gallons a day, which are poor. No diversions.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 2.S 1.2 14.5 2.4 4.4 1.5 23.5 2.8 121 6.7 1.8 36 3.0 151 10.0 2.1

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 6.2 81 5.8 8.0 85 .7 12.1 10.0 32 34 14.8 26.5 2 6.4 65 5.5 7.3 22.5 .6 11.2 54 8.5 10.6 24 13.2 3 19.6 21.5 11.7 6.0 10.0 .6 e.7 20 7.2 14.1 13.6 8.6 4 90 17.5 17.2 19. S 9.0 .9 7.8 12.4 6.6 8.5 8.0 6.8 5 84 10.2 7.4 7.4 16.4 .4 7.2 11.3 6.4 86 6.6 6.0 6 58 10.8 S.6 9.0 18.7 4.4 7.0 8.0 6.2 52 6.0 5.6 7 41 7.1 11.0 7.4 28 4.4 7.2 7.2 63 12.6 5,7 5.4 8 15.6 6.3 12.1 11.1 23 4.4 53 6.9 96 8.7 9.1 5.9 9 13.2 6.3 6.9 9.6 14.5 16.9 10.3 6.6 20 31 16.4 24.5 10 10.2 6.2 5.9 6.0 14.0 6.S 7.S 6.4 23 84 11.0 132 11 8.2 8.2 6.8 5.5 9.4 5.1 7.2 6.6 IS. 8 52 12.2 17.0 12 10.5 10.0 9.6 5.3 7.3 20.5 7.0 13.0 43 15.9 14.1 9.8 13 12.8 7.8 5.9 5.4 6.3 5,9 6.9 10,9 49 9.0 9.1 7.2 14 9.5 11.0 5.3 4.8 5.9 5.4 6.8 7.0 68 15.6 9.0 23.5 15 13.0 59 4.9 4.8 5.5 4,9 6.4 7.4 49 10.0 8.4 18.0 16 60 43 4.9 4.6 5.5 4.6 6.4 6.8 19.8 7.5 6.8 9.2 17 88 76 4.S 8.6 5.4 4.4 6.3 6.4 12.1 7.0 6.0 13.5 18 15.3 12.0 4.4 11.5 5.1 4.3 6.3 6.4 16.2 6.9 5.6 16.2 19 13.9 8.3 4.4 5.6 5.0 4.3 6.3 6.2 13.0 6.4 5.4 8.2 20 36 7.1 4.3 5.0 9.1 4.6 6.3 6.0 10.0 6.2 9.3 7.7 21 39.5 6.3 4.2 7.2 10,4 4.6 6.2 6.0 8.0 5.9 45 6.4 22 16.2 5.8 4.1 16.5 5.8 4.3 6.2 5.9 7.2 5.6 7.8 5.6 23 12.0 8.7 4.6 11,2 5.1 80 17.7 19.8 10.1 5.5 6.8 5.4 24 11.5 6.3 4.6 13,3 5.4 31 9.5 9.2 7.4 5.5 5.9 5.0 25 35.5 7.0 4.1 9,6 10.7 70 6.6 10.0 6.8 5.5 17.9 5.0 26 67 10.5 15.0 6.5 6.0 62 7.0 7.7 53 22 2S.5 4.8 27 34 10.9 6.5 5.9 5.4 50 9.6 17.5 34.5 7.5 8.4 5.0 28 14.3 17.7 6.6 15.2 5.0 43 63 15.2 11.0 6.4 8.7 4.8 29 10.0 15.0 5.5 111 4.9 33 59 11.2 6.8 13.9 6.2 30 10.0 9.4 19.6 23.5 4.8 40 13.6 22.5 13.8 11.0 6.0 31 15.7 6.8 38 18.2 11.6 62 11.4

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 90 6.2 28.3 43.8 S77 2,690 Aug 81 5.8 18.7 28.9 579 1,780 Sep 19.6 4.1 7.41 11.5 222 682 Oet 111 4.6 13.2 20.4 411 1,260 NOT 85 4.8 12.3 19.0 369 1,130 Dee 80 . 4.3 18.1 28.0 560 1,720 C alendar year 193 175 4.1 17.4 26.9 6,360 19,510 Jan 63 6.2 13.2 20.4 408 1,250 Feb 54 5.9 11.1 17.2 311 954 Mar 96 6.2 25.9 40.1 802 2,460 Apr 86 5.5 18.8 39.1 562 1,730 May 45 5.4 11.8 18.3 366 1,120 June...... 132 4.8 14.0 21.7 419 1,290 Piscal year 1937- 132 4.1 16.1 24.9 5,890 18,070 ISLAND OF KAUAI 35

Hanakoa Stream near Hanalei

Location.- Lat. 22°11'00", long. 159°37'35", three-quarters of a mile upstream from mouth and 7i miles west of Hanalei. Altitude, 470 feet, by barometer. Drainage area.- 1.1 square miles. Records available.- December 1931 to June 1938. Extremes._- Maximum discharge during year, 569 million gallons a day (880 second-feet) June 10 (gage height, 5.51 feet), from rating curve extended above 30 million gallons a day; minimum, 0.46 million gallons a day (0.71 second-foot) Jan. 22, 23. 1931-38: Maximum discharge, that of June 10, 1938; minimum, 0.17 mil]ion gallons a day (0.26 second-foot) Mar. 21, 22, 1934. Remarks.- Records good except those above 50 million gallons a day, which are poor. No diversions.

Rating tables, flacal year 1937-38 (gage height, in feet, and discharge, in raillio gallons a day) July 1 to June 1O June 11 to June 3O 1.05 0.46 5.1 2.4 47 1.1 1.01 1.1 .81 9.7 2.7 71 1.2 2.2 1.15 1.30 1.8 15.5 3.0 101 1.3 3.65 1.2 1.89 2.0 1.4 5.4 1.3 3.35 2.2 1.6

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oot. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 0.73 35 1.41 1.63 31 0.66 2.9 2.35 17.0 13.0 3.7 6.3 2 .73 26 1.41 1.30 8.0 .66 2.45 29.5 2.2 2.9 8.7 3.85 3 4.8 7.4 3.65 1.10 3,2 .59 1.63 8.5 1.41 3.35 3.2 1.76 4 40 5,3 4.9 5.6 2.6 .81 1.30 4.9 1.10 1.76 1.52 1.30 5 34.5 3.5 1.89 1.76 4.2 ,59 1.10 3.35 .90 39.5 1.00 1.10 6 19.6 3.2 2.2 1.89 5.5 .59 1.00 1.76 .90 26 .81 .90 7 12.5 2.35 2.75 1.52 7.4 .59 1.00 1.30 15.0 4.6 .66 .81 8 4.2 2.05 3.5 1.41 8.6 .52 29 1.20 47 2.75 1.00 1.00 9 3.7 1.89 1.76 1.52 4.6 5.3 2.75 1.00 8.1 9.0 2.9 5.3 10 2.45 1.76 1.52 1.00 4.4 1.41 1.41 .90 7.6 45 2.2 72 11 1.89 2.2 1.63 1.00 2.75 .90 1.20 1.00 5.7 25 1.30 9.8 12 2.6 2.9 1.89 .90 1.89 7.2 1.00 5.0 17.4 7.0 5.2 4.2 13 2.9 1.89 1.20 .90 1.52 1.41 .90 3.25 26.5 3.9 1.52 2.65 14 1.89 2.6 1.10 .81 1.41 1.10 .81 1.20 36 3.9 1.63 8.0 15 1.89 22,5 1.00 .73 1.30 .90 .73 1.10 24.5 2.75 2.05 9.3 16 16,0 27 1.00 .66 1.20 .73 .66 .81 7.7 1.89 1.20 3.05 17 30.5 39.5 1.00 1.23 1.10 .73 .66 .73 4.0 1.63 .90 4.4 18 3.9 4.9 .90 2.65 1.00 .66 .59 .73 4.4 1.41 .81 5.7 19 4.1 3.35 .90 1.20 1.00 .66 .59 .66 3.35 1.30 .73 2.5 80 9.0 2.6 .81 .90 1.30 .81 .59 .65 9.35 1.20 .66 2.05 81 10.6 2.05 .81 1.97 1.76 .81 .52 .59 1.76 1.10 16.3 1.69 22 3.9 1.76 .81 3.2 1.00 .59 .52 .59 1.41 1.00 2.05 1.44 23 2.75 2.35 .90 2.05 .90 26.5 7.6 10.1 2.2 .90 1.30 1.33 24 2.75 1.76 .90 1.76 .90 19.6 1.81 2.3 1.30 .81 1.00 1.22 85 9.9 1.76 .73 1.76 1.89 30.5 .73 2.45 1.20 .90 1.64 1.11 26 25 2.75 3.0 1.20 1.10 26.5 .81 1.41 30 7.3 11.6 1.01 27 7.4 3.35 1.20 1.00 .90 15.3 1.30 5.9 19.0 1.41 2.2 1.11 28 3.9 4.8 1.20 3.1 .81 12.5 25.5 3.9 3.35 1.00 1.76 1.01 29 2.6 3.9 1.00 4B .73 8.7 36 2.6 1.00 2.4 1.44 30 2.45 2.45 4.9 6.3 .73 12.8 4.4 3.7 3.3 2.75 1.22 31 3.8 1.76 10.8 4.6 3.35 19.1 1.63

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 40 0.73 8.80 13.6 273 838 Avgi 39.5 1.76 7.31 11.3 227 695 Sep 4.9 .73 1.73 2.68 51.8 159 Oot 48 .66 3.58 5.54 111 340 HOT 31 .73 3.49 5.40 105 321 Dec 30.5 .52 5.97 9.24 185 568 C alendar year 193 76 .52 5.56 8.60 2,030 6,220 Jan 36 .52 4.35 6.73 135 414 Peb 29.5 ' .59 3.47 5.37 97.1 298 Mar 47 .90 10.3 15.9 319 978 Apr 11...... 45 .81 7.22 11.2 217 665 May 16.3 .66 2.78 4.30 86.3 265 Jun 72 .81 R.28 8.17 159 487 F Iscal year 1937- 72 .52 5.38 8.32 1,970 6,030 36 ISLAND OF KAUAI

Kalalau §tream near Hanalei

Location.- Lat. 22009'50", long. 159°38'15", 2 miles upstream from mouth and 9 miles southwest of Hanalei. Altitude, 960 feet, by barometer. Drainage area.- 1.6 square miles. Records available.- November 1931 to June 1938. Extremes.- Maximum discharge during year, 229 million gallons a day (354 second-feet) June 10 (gage height, 3.37 feet), from rating curve extended above 18 million gallons a day; minimum, 2.75 million gallons a day (4.25 second-feet) Jan. 23. 1931-38: Maximum discharge, that of June 10, 1938; minimum, 1.9 million gallons a day (2.9 second-feet) Dec. 10, 11, 1933. Remarks.- Records good except those above 25 million gallons a day, which are poor. No diversions.

Rating table, fiscal year 1937-38 (gage freight, in feet, and discharge, in million gallons a day) 0.9 2.25 1.2 2.0 1.0 3.15 1.4 10.5 2.5 1.1 4.4 1.6 17.0

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 4.7 10.0 3.85 3.75 9.1 3.5 4.4 6.3 12.0 8.2 4.4 4.4 2 4.7 10.0 3.85 3.75 6.9 3.35 4.1 21.5 6.5 5.9 5.6 4.4 3 5.2 7.3 4.1 3.75 4.9 3.35 3.75 13.6 5.2 5.2 5.1 4.1 4 9.4 6.1 4.1 3.85 4.3 3.35 3.5 10.3 4.6 4.7 4.6 4.1 5 13.7 5.4 4.0 3.75 4.1 3.35 3.35 8.9 4.4 15.5 4.3 4.1 6 10.3 5.1 3.85 3.75 4.1 3.35 3.25 5.9 4.1 33 4.1 4.0 7 8.6 4.9 3.85 3.75 4.1 3.35 3.15 4.9 5.2 8.6 4.1 4.0 8 6.9 4.7 3.85 3.6 5.2 3.35 16.1 4.4 15.0 6.5 4.1 4.1 9 5.9 4.7 3.85 3.6 4.4 4.3 6.3 4.0 6.9 5.9 4.3 4.7 10 5.2 4.6 3.75 3.6 4.3 3.6 4.3 3.85 6.7 10.4 4.3 27 11 4.9 4.4 b.75 3.6 4.0 3.6 3.75 3.85 6.3 6.3 4.3 8.6 12 4.9 4.4 3.75 5.6 3.85 6.4 3.5 8.3 8.1 6.3 4.4 5.9 13 4.9 4.4 3.75 3.6 3.75 4.1 3.25 8.8 13.5 5.2 4.3 4.7 14 4.7 4.4 3.75 3.6 3.75 3.75 3.15 5.9 18.2 4.9 4.4 5.6 15 4.6 7.5 3.75 3.6 3.75 3.6 3.05 5.1 15.6 4.6 4.6 6.5 16 5.4 16.2 3.75 3.6 3.75 3.5 2.95 4.4 9.8 4.4 4.3 4.8 17 9.4 35 3.75 3.7 3.75 3.5 2.95 18 6.1 9.8 3.75 3.85 3.6 3.35 2.85 4.1 6.1 4.3 4.1 5.2 19 5.6 7.1 3.75 3.75 3.6 3.35 2.85 4.0 5.4 4.1 4.1 4.4 20 5.9 5.8 3.75 3.6 3.6 3.6 2.85 3.85 4.9 4.1 4.1 4.1 21 5.6 5.1 3.75 3.85 3.6 3.5 2.85 3.85 4.6 4.0 5.6 4.0 22 5.1 4.7 3.75 4.0 3.6 3.35 2.85 3.75 4.4 4.0 4.3 3.85 23 4.9 4.4 3.75 3.75 3.6 12.2 5.3 6.6 4.3 3.85 4.1 3.75 24 4.9 4.3 3.75 3.75 3.6 10.1 4.1 5.4 4.1 3. 85 4.1 3.75 25 5.4 4.3 3.75 3.75 3.6 12.8 3.25 5.2 4.1 3.85 4.3 3.6 26 8.9 4.4 3.65 3.75 3.6 11.0 3.15 4.6 24.5 5.2 4.6 3.6 27 7.5 4.4 3.75 3.75 3.6 9.3 3.15 6.9 26 4.3 4.3 3.6 28 5.9 4.4 3.75 3.85 3.6 8.6 14.6 6.2 9.3 4.1 4.1 3.6 29 5.2 4.3 3.75 10.4 3.5 7.3 48 7.1 4.0 4.1 3.6 30 4.9 4.1 4.0 6.1 3.5 6.3 12.8 6.5 4.4 4.1 3.6 31 4.9 4.0 5.4 5.1 8.1 6.7 4.1

Million gallons a day Second- Total run-off Month feet (mean) Million Haxlnum Minimum Mean gallons Acre-feet J-il 13.7 4.6 6.26 9.69 194 596 Augi 35 4.0 6.78 10.5 210 645 Sep 4.1 3.75 3.81 5.89 114 351 Oct 10.4 3.6 4.06 6.2S 126 387 Kov 9.1 3.5 4.15 6.42 125 382 Dec 12.8 3,35 5.26 8.14 163 501 C alendar year 193 74 3.35 6.50 10.1 2,370 7,280 Jan 48 2.85 6,18 9.56 192 5S8 Peb 21.5 3.75 6.38 9.87 179 548 Mar 26 4.1 8.62 13.3 267 820 Apr 33 3.85 6.54 10.1 196 602 May 5.6 4.1 4.37 6.76 136 416 Jun 27 3.6 5. 22 8.08 156 480 P Lscal year 19*7- 48 2.85 5.64 S.73 2,060 6,320 ISLAND OF OAHU 37

Right Branch of Worth Fork of Kaukonahua Stream, near Wahlawa Location.- Masonry dam control, lat. 21°31'15", long. 157°56'55", 200 feet upstream from intake of Wahiawa Water Co.'s tunnel, which is just downstream from confluence of right and left branches of North Fork of Kaukonahua Stream, and 8 miles northeast of Wahiawa. Altitude, 1,200 feet, from topographic map. Drainage area.- 1.2 square miles, Records available.- May 1913 to January 1933, February 1934 to June 1938. Average dlschargeT- 19 years (1915-24, 1926-32, 1934-38), 8.00 million gallons a day (12.4 second-feet). Extremes.- Maximum discharge during year, 713 million gallons a day (1,100 second-feet) Sept. 28 (gage height, 7.82 feet), from rating curve extended above 40 million gallons a day; minimum, 0.93 million gallons a day (1.44 second-feet) July 1. 1913-38: Maximum discharge, 1,160 million gallons a day (1,790 second-feet) Jan. I, 1933 (gage height, 9.63 feet), from rating curve extended above 120 million gallons a day; minimum, 0.09 million gallons a day (0.15 second-foot) Mar. ?,2, 1926. Remarks.- Records good except those for periods of faulty gage heights, Dec. 15-21, Jan. 6-17, Feb. 7-21, Feb. 25 to Apr. 1, May 30 to June 2, 8-27 (computed on basis of records for station on the left Branch) and those above 60 million gallons a day, which are poor. No diversions above station.

Rating table, fiscal year 1937-38 (gage height, in feet, and diacliarge, in million gallons a day) 2.6 0.30 3.2 7.3 4.0 2.8 1.35 3.4 14.1 4.4 91 3.0 3.4 3.6 23 4.8 145

Discharge, in million gallons, fiscal year July 1937 to June 193S

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 1.17 21.5 1.86 5.0 18.0 5.4 5.8 23.5 1.6 5.0 3.7 35 2 1.52 101 1.78 3.8 15.6 3.55 4.8 28 1.4 2.95 10.1 33 3 1.35 30 1.69 2.75 3.6 2.2 3.95 36.5 1.4 5.3 23 9.6 4 8.5 8.3 5.S 2.85 36 2.05 3.4 6.1 1.3 2.2 9.5 5.8 5 7.S 6.3 2.65 4.6 15.1 1.86 3.0 14.9 1.5 2.1 3.25 4.4 6 4.1 4.S 2.1 2.3 20.5 1.69 2.8 4.4 2.5 29 4.2 3.65 7 5.3 4.6 9.4 3.5 7.0 1.60 4.0 3.8 8.0 11.6 2.75 3.4 8 2.4 3.65 8.9. 4.2 7.4 1.44 12.0 4.0 30 4.9 2.1 3.2 9 1.78 3.25 2.4 2.1 3.75 1.52 4.5 4.5 4.0 42 9.9 15 10 1.44 3.15 2.85 1.94 3.15 1.35 3.2 11 4.1 44 3.65 50 11 1.44 3.15 6.7 1.78 6.5 1.41 2.6 35 2»8 15.3 5.0 25 12 1.44 3.4 21.5 1.69 2.75 28 2.5 10 4.0 13.0 4.8 27 13 1.83 7.6 3.0 4.8 2.3 2.1 2.2 13 7.0 6.3 6.0 7.0 14 6.3 4.5 2.3 20.5 2.1 *5.5 2.0 4.5 4.5 8.4 3.95 6.4 15 1.60 12.2 2.5 5.4 2.05 2.5 1.8 3.5 2.7 4.4 2.5 4.5 16 2.15 40 2.1 4.4 1.86 1.8 1.7 3.2 2.5 3.65 2.05 3.8 17 84 46 1.86 5.1 1.78 3.5 1.8 3.0 12 3.25 1.86 3.3 18 4.S 5.4 1.69 3.9 1.60 1.7 1.6 4.B 10 2.85 1.69 4.0 19 3.0 4.2 1.69 2.3 1.52 1.4 1.52 3.0 13 2.65 1.86 3.0 20 5.0 3.4 1.52 2.05 1.44 1.3 14.5 2.7 4.0 2.4 12.1 2.6 21 24 3.0 1.44 1.86 3.7 2.0 5.6 2.5 3.2 2.2 29 2.3 22 7.5 2.75 1.52 2.25 1.52 14.2 2.2 3.0 2.7 2.1 3.4 2.2 23 6.5 2,e 2.1 2.4 4.3 39.5 1.78 2.3 3.0 2.05 2.5 2.0 24 5.3 2.3 2.2 4.8 88 38.5 4.8 2.1 2.0 1.94 2.1 7.0 25 11.2 2.3 9.8 2.S5 62 76 1.69 2.1 3.0 1.78 21 4.0 26 4.8 3.05 61 1.69 6.3 19.5 33.5 1.7 1.9 1.86 33.5 2.2 27 4.6 2.4 53 1.35'1.52 4.6 10.2 81 1.5 20 1.69 3.95 4.0 28 3.15 5.4 55 3.4 38 67 1.5 4.5 1.52 11.7 7.1 29 24.5 3.15 5.0 4.1 2.75 62 11.9 9.0 1.44 20 2.05 30 4.2 2.75 4.3 2.4 2.65 17.9 7.3 17 1.94 35 2.85 31 3.15 2.3 1.60 8.3 6.0 18 23

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 84 1.17 7.91 12.2 245 753 Aug 101 2.3 11.2 17.3 348 1,070 Sep 61 1.44 9.36 14.5 281 862 Oct 20.5 1.35 3.61 5.59 112 343 Sov se 1.44 11.1 17.2 333 1,020 Dec 76 1.3 12. S 19.8 398 1,220 C alendar year 193 151 .99-^ 10.8 16.7 3,930 12,060 Jan 81 1.52 9.76 15.1 302 "92S Fob 36.5 1.5 8.42 13.0 236 724 Mar 30 1.3 60 54 10.1 203 622 Apr 44 1.44 7.66 11.9 230 705 May 35 1.69 9.65 14.9 299 918 Jun 50 2.0 9.51 14.7 285 876 PIscal year 1937 101 1.17 S.97 13.9 3,270 10,040

Partly estimated. 38 ISLAND OF OAHU

Left Branch of North Fork of Kaukonahua Stream, near Wahiawa Location.- Lat. 21°31'10", long. 157°56'55", 100 feet upstream from intake of Wahiawa Water Co.'s tunnel, which Is just downstream from confluence of right and left branches of North Fork of Kaukonahua Stream, and 8 miles northeast of Wahiawa. Altitude, 1,200 feet, from topographic map. Drainage area.- 1.5 square miles. Records available.- May 1913 to June 1938. Average discharge"?- 21 years (1915-24, 1926-38), 11.5 million gallons a day (17.8 second- feet). Extremes.- Maximum discharge during year, 2,290 million gallons a day (3,540 second-feet) Sept. 28 (gage height, 8.43 feet), from rating curve extended above 70 million gallons a day; minimum, 1.2 million gallons a day (1.9 second-feet) July 1. 1913-38: Maximum discharge, 5,400 million gallons a day (8,360 second-feet) Jan. 1, 1933 (gage height, 11.7 feet, from floodmark on well), from rating curve extended above 15 million gallons a day; minimum, less than 0.1 million gallons a day (0.2 second- foot) June 15, 1931. Remarks.- Records good except those for period of missing gage heights, Jan. 4-13 (com- puted on basis of records for station on the right branch), and those above 90 million gallons a day, which are fair. No diversions above station.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallo day) 1.0 1.1 1.8 17.3 3.5 160 1.2 2.9 2.0 26 4.0 240 1.4 6.1 2.5 55 1.6 10.9 3.0 100

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 1.6 17.9 2.9 8. 3 38.5 5.3 7.4 50 1.8 6.7 10.7 40 2 2.9 154 3.2 4. 8 25 3.9 5.9 33 1.4 4.2 28.5 39 3 3.7 56 2.6 4. 2 6.6 2.4 5.0 47 1.4 12.1 31 11.6 4 22 13.0 11.2 6. 2 41 2.0 4.3 7.2 1.3 3.5 14.5 7.4 5 12.9 13.5 8.5 8. 5 26.5 1.9 4.0 19.0 1.8 3.9 6.0 5.9 6 11.6 8.6 5.8 3. 5 30 1.7 3.7 5.7 3.5 37 7.3 4.8 7 7.3 7.2 11.3 9. 2 12.2 1.6 5.0 4.8 11.5 15.7 4.9 4.7 8 3.7 5.7 14.8 6. 8 10.3 1.5 15 5.0 37 7.0 3.6 1.5 9 2.9 5.6 3.9 3. 2 5.4 1.6 6.0 6.1 5.7 46 17.6 18.0 10 2.1 6.5 4.5 2. 8 4.5 1.4 4.5 12.3 6.0 64 6.1 68 11 2.2 7.9 20.5 2. 5 16.6 1.8 3.5 38.5 3.2 25.5 6.4 35 12 2.4 11.8 26.5 2. 2 4.5 42 3.1 10.3 4.5 28 9.2 37 13 1.7 29 4.8 12. 3 3.6 2.6 2.8 13.9 8.1 11.4 8.4 8.6 14 10.2 14. g 3.7 20. 5 3.2 13.7 2.5 5.2 5.6 27.5 8.7 7.4 15 2.6 18.7 4.3 5. 3 2.9 3.5 2.2 4.3 3.2 7.9 4.5 5.6 16 5.5 52 3.0 3. 5 2.7 2.1 2.0 3.9 2.8 6.1 3.5 4.5 17 89 78 2.8 5. 6 2.5 3.8 2.1 3.6 15.2 5.2 3.0 4.2 18 7.0 9.3 2.4 5. 2 2.2 2.0 2.0 5.2 33 4.7 2.8 5.3 19 4.0 7.0 2.6 2. 8 2.0 1.6 1.8 3.7 12.0 4.2 3.0 3.5 20 7.2 5.9 2.4 2. 6 2.0 1.5 19.7 3.0 4.8 3.9 14.5 3.3 21 30 5.0 1.9 2. 4 5.4 2.6 20.5 2.7 3.9 3.5 39 2.9 22 14.8 4.5 2.5 4. 5 2.0 21 4.6 2.5 3.5 3.2 5.2 2.8 23 15.3 4.2 5.0 4. 2 9.2 *62 2.8 2.4 4.2 3.0 4.2 2.6 24 8.9 4.0 7.4 7. 5 61 *50 9.5 2.4 2.7 3.0 3.5 9.6 25 24 4.0 17.1 4. 6 38.5 *82 2.6 2.4 4.5 2.6 39 5.4 26 8.8 6.4 94 2. 5 5.6 *19.5 40 1.9 2.5 4.7 58 2.5 27 10.9 4.8 39 2. 0 4.5 11.5 71 1.7 23 2.5 6.3 4.5 28 5.7 11.1 39 1. 7 3.6 63 93 1.7 5.7 2.4 13.5 10.6 29 20.5 5.1 6.1 8. 1 3.0 69 13.6 9.3 2.2 25 2.5 30 9.5 6.3 5.6 4. 0 2.9 22 9.4 18.0 5.0 44 6.9 31 5.0 4.0 2. 5 9.9 8.6 18.2 24

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons A ore -feet Jul 89 1.6 11.5 17.8 356 1,090 Aug 154 4.0 18.7 28.9 581 1,780 Sep 94 1.9 12.0 18.6 359 1,100 Oct 20.5 1.7 5.29 8.18 164 503 NOT 61 2.0 12.6 19.5 378 1,160 Dec 82 1.4 16.5 25.5 510 1,570 C alendar year 193 198 1.4 14.0 21.7 5,110 15,660 Jan 93 1.8 12.2 18.9 378 1,160 Feb 50 1.7 10.7 16.6 299 919 Mar 37 1.3 8.36 12.9 259 796 Apr 64 2.2 11.9 18.4 357 1,090 May 58 2.8 14.7 22.7 456 1,400 Jun 68 1.5 12.2 18.9 366 1,120 Fiscal year 1937- 154 1.3 12.3 18.9 4,460 13,690

»Partly estimated. ISLAND OF OAHU 39

Puhawai Stream at Lualualel, near Waianae

Location.- Parshall flume, lat. 21°28'10", long. 158°08'00", in Lualualel Valley, 1 mile north of McCandless ranch house and 5 miles northeast of Waianae. Altitude, 600 feet, from topographic map. Drainage area.- 0.6 square mile. Records available.- September 1930 to June 1938. Extremes.- Maximum discharge during year not determined, owing to faulty gage-height rec- ord; minimum, 0.02 million gallons a day (0.03 second-foot) Sept. 21, 22, Oct. 2-7, 10-12, 16, Nov. 29, 30. 1930-38: Maximum discharge, 60 million gallons a day (93 second-feet) Feb. 21, 1932 (gage height, 3.58 feet); minimum, 0.01 million gallons a day (0.02 second-foot) Dec. 19, 20, 1931, Jan. 11, 1932, June 25, 26, 1935, Sept. 22, 23, 1936. Remarks.- Records fair except those for periods of faulty gage heights, Dec. 23-27, Jan. 28 to Feb. 5, 12-16, Mar. 6, 7, 20-28, Apr. 9, 10 (computed on basis of rainfall and records for stations oh streams In Kaukonahua and Moanalua Valleys) and those above 5 million gallons a day, which are poor. Continuous rainfall records are obtained at station.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Fet>. Mar. Apr. May June

1 0.05 0.12 0.06 0.03 0.07 0.03 0.22 0.05 0.25 0.35 0.13 0.12 2 .06 .12 .05 .02 .11 .03 .17 4.0 .18 .23 .14 .18 3 .05 .06 .05 .02 .05 .04 .13 50 .20 .22 .13 .13 4 .06 .05 .07 .02 .23 .07 .10 3.0 .15 .19 .13 .12 5 .06 .05 .06 .02 .34 .03 .09 5.0 .14 .20 .12 .12 6 .04 .04 .05 .02 .39 .03 .06 1.96 .25 .35 .12 .10 7 .05 .03 .05 .02 .22 .03 .06 .97 .15 .20 .10 .09 8 .17 .03 .05 .03 .16 .03 .18 .63 .69 .15 .10 .09 9 .08 .03 .05 .03 .10 .06 .13 .39 .38 2.0 .13 .09 10 .06 .05 .05 .02 .06 .03 .09 .30 .28 3.0 .12 .10 11 .05 .03 .06 .02 .06 .03 .06 .25 .29 .82 .12 .29 12 .05 .03 .05 .02 .05 3.2 .06 .20 .25 .49 .10 .22 13 .04 .03 .07 .03 .05 .26 .06 .70 .21 .35 .48 .12 14 .03 .04 .06 .03 .04 .12 .05 .40 .18 .31 .75 .09 15 .03 .06 .04 .03 .04 .06 .05 .30 .17 .28 .42 .09 16 .03 .06 .04 .02 .04 .05 .05 .60 .13 .25 .20 .08 17 .05 .30 .04 .05 .09 .04 .05 .47 .10 .20 .15 .08 18 .04 .10 .03 .07 .06 .04 .05 .36 .08 .18 .13 .08 19 .03 .06 .03 .07 .05 .03 .04 .32 .09 .17 .12 .08 20 .05 .05 .03 .05 .05 .03 .05 .26 .08 .16 .12 .08 21 .05 .05 .02 .12 .05 .03 .06 .20 .08 .14 .12 .10 22 .04 .05 .02 .08 .03 .03 .05 .18 .08 .14 .12 .10 23 .03 .03 .03 .19 .03 .59 .06 .20 .07 .12 .13 .10 24 .05 .03 .03 .28 .03 .34 .18 .23 .07 .12 .12 .10 25 .05 .03 .03 .14 .04 1.2 .05 .29 .06 .12 .13 .10 26 .05 .03 .08 .06 .03 7.7 .05 .22 .06 .12 .16 .10 27 .05 .04 .05 .05 .03 1.5 .05 .22 .90 .10 .12 .09 28 .06 .05 .03 .05 .03 .58 2.0 .22 .40 .12 .12 .09 29 .05 .05 .03 .04 .02 .64 .50 .90 .10 .10 .08 30 .03 .30 .03 .04 .02 .49 .50 1.12 .10 .10 .09 31 .03 .13 .04 .32 .10 .60 .10

Million gallons a day Second- Total run-off Month feet (mean) Million H&XlfflUDl Minimum Mean gallons Acre -feet Jul 0.17 0.03 0.051 0.079 1.57 4.8 Augi .30 .03 .069 1.07 2.13 6.5 Sep .08 .02 .045 .070 1.34 4.1 Dot .28 .02 .055 .085 1.71 5.2 HOT .39 .02 .086 1.33 2.57 7.9 Dec 7.7 .03 .570 .882 17.7 54 C alendar year 193 7.7 .02 .209 .323 76.3 234 Jan 2.0 .04 .173 .268 5.35 16 Fet> 50 .05 2.57 3.98 71.9 221 Mar 1.12 .06 .277 .429 8.59 26 Apr 3.0 .10 .376 .582 11.3 35 May .75 .10 .165 .255 5.13 16 Jun .29 .08 .110 .170 3.30 10 F Iscal year 1937- 50 .02 .363 .562 133 406 40 ISLAND OF OAHU

Pearl Harbor Springs at Waiawa, near Pearl City

Location.- Sharp-crested weir, lat. 21°23'35", long. 157°59'15", at rear of Oahu Sugar Co.'s pumping plant 9, on right bank of Waiawa Stream, 0.7 miles (revised) from Pearl City and 9.8 miles (revised) northwest of Honolulu. Records available.- March 1931 to June 1934, July 1937 to June 1938. Extremes.- Not*determined because extremes at gaglng-statlon site are caused by changes In tidal backwater. Remarks.- Records good. Oahu Sugar Co.'s pump 9 diverts about 3 million gallons a day at times when water is needed for irrigation of sugarcane. Surface run-off caused by flood not Included In figures of discharge given below.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day)

1.9 7.3 2.0 10.3 2.1 13.6 2.2 17.1

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 14.2 12.9 9.3 13.2 12.5 13.2 13.9 13.9 14.6 13.2 13.2 12.9 2 14.2 12.9 9.0 13.2 12.5 13.2 13.9 14.2 14.6 13.2 12.9 13.9 3 14.2 12.9 10.3 13.6 12.5 13.2 13.9 14.2 14.6 13.6 12.5 13.6 4 14.1 12.9 12.9 13.6 12.5 13.2 13.9 14.2 14.2 13.6 12.5 13.6 5 14.1 12.9 12.9 13.6 12.5 13.6 13.6 14.2 14.2 13.6 12.9 13.6 6 14.1 12.9 12.9 13.6 12.5 13.6 13.6 14.2 14.2 13.6 13.2 13.6 7 14.0 12.9 9.6 13.6 12.9 13.6 13.6 13.9 14.2 13.6 10.9 13.2 8 14.0 12.9 8.5 13.6 12.9 13.6 13.6 13.9 14.2 13.6 9.6 10.6 9 13.9 9.3 8.7 13.6 12.9 13.6 13.6 14.2 14.2 13.6 9.3 9.6 10 13.9 8.5 9.0 13.6 12.9 13.6 13.6 14.2 14.2 13.6 9.3 9.6 11 13.9 8.7 «9.0 13.6 12.9 13.6 13.6 14.6 14.2 13.6 9.3 10.6 12 13.8 8.7 *9.1 13.6 12.9 13.6 13.6 14.6 14.2 13.6 9.3 13.6 13 13.8 8.5 «9.2 13.6 12.9 13.6 13.2 14.6 14.2 13.6 9.6 10T3 14 13.7 8.7 «9.3 13.6 12.9 13.9 13.2 14.6 14.2 13.6 10.9 9.6 15 13.7 9.0 9.3 13.6 12.5 13.9 13.2 14.6 14.2 13.6 13.2 9.6 16 13.7 8.7 9.3 13.6 12.2 14.2 13.2 14.6 14.2 13.6 9.6 9.6 17 13.6 8.7 9.3 13.6 12.2 14.2 13.2 14.6 14.2 13.2 9.6 9.6 18 13.6 8.7 10.9 13.6 12.2 14.2 12.9 14.6 13.9 13.2 9.3 9.3 19 13.5 8.7 11.9 13.6 12.2 14.2 12.9 14.6 13.9 13.2 8.7 9.3 20 13.5 8.7 9.3 13.6 12.5 13.9 12.9 14.6 13.9 13.2 9.0 9.6 21 13.5 10.6 9.3 13.2 12.9 13.9 12.9 14.6 13.9 12.9 10.3 9.3 22 13.4 12.5 9.0 12.9 12.9 13.9 12.9 14.6 13.9 12.9 12.9 10.0 23 13.4 9.3 9.0 12.9 13.2 13.6 13.2 14.6 *13.8 13.2 9.3 10.3 24 13.3 8.5 9.0 13.2 13.2 13.6 13.6 14.6 *13.7 13.2 8.7 10.3 25 13.3 8.5 9.0 12.9 13.2 13.6 13.6 14.6 «13.6 13.2 8.7 11.5 26 13.2 8.5 8.7 12.5 12.9 13.9 13.6 14.6 »13.5 12.9 8.7 13.9 27 13.2 8-. 5 9.0 12.5 12.9 13.9 13.6 14.6 «13.4 12.9 8.7 10.3 28 13.2 10.3 12.2 12.5 13.2 13.9 13.9 14.6 *13.3 12.9 10.9 10.3 29 12.9 11.2 13.2 12.5 12.9 13.6 13.9 »13.2 12.9 12.9 10.3 30 12.9 9.3 13.2 12.5 12.9 13.6 13.9 13.2 12.9 13.6 10.0 31 12.9 9.3 12.5 13.6 13.9 13.2 10.6

Million gallons a day Second- Total run-off Month feet (mean) Million Ma*i»u» Minimum Mean gallons Acre -feet Jul 14.2 12.9 13.6 21.0 423 1,300 Aug 12.9 8.5 10.1 15.6 315 965 Sep 13.2 8.5 10.0 15.5 301 925 Oct 13.6 12.5 13.3 20.6 411 1,260 Hov 13.2 12.2 12.7 19.6 382 1,170 Dec 14.2 13.2 13.7 21.2 425 1,300 C alendar year Jan 13.9 12.9 13.5 20.9 418 1,280 Peb 14.6 13.9 14.4 22.3 404 1,240 Mar 14.6 13.2 14.0 21.7 433 1,330 Apr 13.6 12.9 13.3 20.6 400 1,230 May 13.6 8.7 10.6 16.4 330 1,010 Jun 13.9 9.3 11.0 17.0 332 1,020 P Iscal year 1937- 14.6 8.5 12.5 19.3 4,570 14, 030 »Gage height missing; discharge interpolated. ISLAND OF OAHU 41 Pearl Harbor Springs at Puukapu, near Pearl City

Location.- Sharp-crested weir, lat. 21°23'2C , long. 157°58'10", on left bank of stream, near levee, two-fifths of a mile from Pes 1 City and 8.9 miles northwest of Honolulu, Zero of gage Is 0.5 foot below mean sea 1 vel. Records available.- July 1931 to June 1938. Extremes.- Not determined because extremes al gaglng-statlon site are caused by changes In tidal backwater. Remarks.- Records excellent. About a mllllc gallons a day Is occasionally diverted from stream. Surface run-off caused by flood Hot Included In figures of discharge given below.

Rating table, fiscal year 1937-38 (gage height, Ln feet, and discharge, In million gallons a day) 2.0 2.95 2.1 3.9 2.2 4.9

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec Jan. Feb. Mar. Apr. May June

1 3.9 3.6 3.4 3.4 3.5 3 4.1 3.9 4.2 4.3 4.6 4.2 2 3.9 3.5 3.5 3.4 3.5 3. 4.1 3^9 4.3 4.3 4.6 4.1 3 3.9 3.5 3.5 3.4 3.6 3. 4.1 3s'.g 9 4.3 .3 4.6 4.1 4 3.9 3.5 3.5 3.4 3.7 3 4.1 4.3 .3 4.6 4.2 5 3.9 3.5 3.5 3.3 3.7 3. 4.1 3.9 4.3 .3 4.6 4.2 6 3.9 3.5 3.5 3.3 3.7 3. 4.1 3.9 4.3 .3 4.6 4.2 7 3)9 3.5 3.4 3.3 3.8 3. 4.2 3.9 4.3 .2 4.6 4.2 8 3.8 3.5 3.4 3.3 3.8 3. 4.2 3.9 4.3 .2 4.6 4.1 9 3.5 3.4 3.4 3.8 3. 4.2 3.9 4.2 .3 4.7 3.95 10 3. 3.5 3.4 3.4 3.9 3. 4.3 3^9 4.2 .4 4.6 3.9 11 3. 3.5 3.4 3.4 3.9 3. 4.1 3.9 4.2 .4 4.5 3.95 12 3. 3.5 3.4 3.5 3.9 3. 3.95 3.95 4.1 .4 4.4 3.95 13 3. 3.5 3.5 3.5 3.9 3. 3.95 3.95 4.1 .4 4.4 3.9 14 3. 3.5 3.5 3.6 3^9 3. 3.95 3.95 4.1 .5 4.4 3.9 15 3. 3.5 3.6 3.6 3.9 3. 3.95 3.95 3.95 .6 4.4 3.9 16 3. 3.5 3.6 3.6 3.9 3. 3.95 4.1 3.95 .6 4.4 3.9 17 3. 3.5 3.6 3.6 s'.9 3. 3.95 4.1 3.95 .6 4.3 3^9 18 3. 3.5 3.6 3.5 3.9 3. 3.95 4.2 3.95 6 4.2 3.9 19 3. 3.5 3.6 3.3 3)9 3. 3.9 4.2 4.1 .6 4.2 3.9 20 3. 3.5 3.6 3.25 3.9 3. 3.9 4.3 4.1 .5 4.2 3.9 21 3. 3.5 3.5 3.25 3.9 3. 3.9 4.3 3.95 4.5 4.2 3.9 22 3. 3.5 3.6 3.25 3.9 3. 3.9 4.3 3.95 4.5 4.2 3.9 23 3.5 3.6 3.6 3^9 3. 3.9 4.3 3.95 4.5 4.3 3*.9 24 3.6 3.5 3.5 3.3 3.9 3. 3.9 4.3 3.95 4.5 4.3 3.9 25 3.6 3.5 3.6 3.4 3.9 3. 3.8 4.3 4.1 4.5 4.3 3.9 26 3.6 3.4 3.4 3.5 3.9 3. 5 3.8 4.3 4.1 4.5 4.3 3.9 27 3.6 3.4 3.4 3.5 3 . 9 3. 5 3.8 4.2 4.2 4.4 4.3 3.8 28 3.6 3.4 3.4 3.6 z'.9 3. 5 3.8 4.2 4.2 4.4 4.4 3.8 29 3.6 3.5 3.4 3.5 3.8 3. 5 3.9 4.1 4.4 4.4 3.8 30 3.6 3.5 3.4 3 5 3.7 4. 3s'.9 9 4.2 4.5 4.4 3.8 31 3.6 3.4 3.5 4. 4.3 4.4

Million gi Ions a day Second- Total run-off Month feet (mean) Million Maximum Hi Imvm Mean gallons Acre-feet Jul 3.9 3.4 3.60 5.57 112 342 Aug 3.6 3.4 3.49 5.40 108 332 Sep 3.6 3.4 3.49 5.40 105 321 Oct 3.6 3.25 3.42 5.29 106 325 Hov 3.9 3.5 3.82, 5.91 115 352 Dec 4.1 3.7 3.85 5.96 119 366 C alendar year 1937 4.5 3.25 3.89 6.02 1,420 4,350 Jan 4.3 3.8 3.99 6.17 124 379 Feb 4.3 3.9 4.06 6.28 114 349 Mar 4.3 3.95 4.14 6.41 128 393 Apr 4.6 4.2 4.43 6.85 133 408 May 4.7 4.2 4.42 6.84 137 420 Jun 4.2 3.8 3.96 6.13 119 365 PIscal year 1937 4.7 3.25 3.89 6. OS 1,420 4,350 42 ISLAND OF OAHU

Pearl Harbor Springs at Loko Kukona, near Pearl City

Location.- Sharp-crested weir, lat. 21°23'30", long. 157°58'00", on left bank of stream, near levee, halt a mile from Pearl City and 8.8 miles northwest of Honolulu. Zero of gags is 0.80 foot below mean sea level. Records available.- June 1931 to June 1938. Extremes.- Not determined because extremes at gaging station-site are caused by changes in tidal backwater. Remarks.- Records excellent. Discharge for Oct. 16-26 interpolated. No diversions. Sur- race run-off caused by floods not included in figures of discharge given below.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day)

2.2 2.55 2.3 3.4

Discharge, in million gallons, fisoal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June 1 3.15 3.05 3.25 3.05 3.05 2.9 2.9 2.8 2.6 2.8 3.05 2.9 2 3.05 3.05 3.25 3.05 3.05 2.9 2 9 2.9 2.6 2.9 2.95 2.95 S 3.05 3.05 3.25 3.05 3.05 2.9 2i95 2.9 2.7 2.9 2.95 2.95 4 3.05 3.15 3.25 3.05 3.15 2.9 2.95 2.9 2.8 2.9 2.95 2.95 5 3.05 3.15 3.25 3.05 3.15 2.9 2.95 2.95 2.8 2.9 2.95 2.9 6 3.05 3.15 3.25 3.15 3.15 2.9 2.95 2.95 2.7 2.9 2.95 2.9 7 3.15 3.15 3.25 3.25 3.25 2.8 2.95 2.95 2.7 2.9 3.05 2.9 8 3.15 3.15 3.25 3.25 3.25 2.8 2.95 2.95 2.7 2.9 3.05 2.9 9 3.15 3.15 3.25 3.25 3.15 2.8 2.95 2.95 2.7 2.9 3.05 2.9 10 3.15 3.05 3.25 3.25 3.15 2.7 2.95 2.95 2.8 2.95 2.95 2.9 11 3.15 3.05 3.25 3.25 3.15 2,7 2.95 2.95 2.7 2.9 2.95 2.9 12 3.15 3.05 3.25 3.25 3.05 2.7 2.95 3.05 2.7 2.9 2.95 2.9 13 3.15 3.05 3.15 3.25 3.05 2.7 2.95 3.15 2.8 2.9 2.95 2.9 14 3.15 2.95 3.05 3.25 3.05 2.7 2.95 3.15 2.8 2.9 2.95 2.9 16 3.15 2.95 3.05 3.25 3.05 2.7 2.95 2.95 2.95 2.9 2.95 2.8 16 3.05 2.95 3.05 3.25 3.05 2.7 2.95 2.95 2.95 2.9 2.95 2.8 17 3.05 2.95 3.05 3.25 3.05 2.7 2.95 2.95 2.95 2.9 2.95 2.7 18 3.05 2.95 3.05 3.25 3.05 2.8 2.9 2.95 2.95 2.9 2.95 2.7 19 3.05 2.95 3.15 3.25 3.05 2.8 2.8 3.05 3.05 2.9 2.9 2.7 20 2.95 3.05 3.15 3.15 3.05 2.8 2.8 2.95 3.15 2.9 2.8 2.7 21 2.95 3.05 3.15 3.15 3.05 2.7 2.7 2.95 3.25 2.9 2.8 2.7 22 2.95 3.05 3.15 3.15 3.05 2.7 2.7 2.95 3.3 2.9 2.9 2.7 23 2.95 3.05 3.05 3.15 2.95 2.7 2.8 2.95 3.3 2.9 2.9 2.6 24 2.95 2.95 2.95 3.05 2.95 2.7 2.8 2.9 3.25 2.9 2.8 2.6 25 2.95 2.95 2.95 3.05 3.05 2.8 2.8 2.8 3.05 2.9 2.8 2.7 26 2.95 2.95 2.95 3.05 3.05 2.8 2.8 2.8 2.8 2.95 2.8 2.7 27 2.95 2.95 2.95 3.05 3.05 2.8 2.8 2.7 2.7 2.95 2.8 2.6 28 2.95 2.95 2.95 2.95 3.05 2.8 2.9 2.6 2.6 2.95 2.8 2.55 29 2.95 2.95 3.05 2.95 3.05 2.8 2.9 2.6 2.95 2.8 2.55 30 2.95 3.05 3.15 2.95 2.95 2.8 2.9 2.8 2.95 2.8 2.55 31 3.05 3.15 2.95 2.8 2.8 2.8 2.9

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 3.15 2.95 3.05 4.72 94.4 290 Auff 3.15 2.95 3.03 4.69 94.0 289 Sep 3.25 2.95 3.13 4.84 94.0 288 Oct 3.25 2.95 3.14 4.86 97.2 298 Hov 3.25 2.95 3.07 4.75 92.2 283 Dec 2.9 2.7 2.78 4.30 86.2 265 C alendar year 19 3.3 2.55 2.98 4.61 1,090 3,340 Jan 2.95 2.7 2.89 4.47 89.4 275 Fob 3.15 2.6 2.93 4.53 82.0 251 Mar 3.3 2.6 2.86 4.43 88.6 272 Apr 2.95 2.8 2.91 4.50 87.2 268 May 3.05 2.8 2.91 4.50 90.3 277 Jun 2.95 2.55 2.78 4.30 83.4 256 Fiscal year 1937- 3.3 2.55 2.96 4.58 1,080 3,310 ISLAND OF OAHU 43

Pearl Harbor Springs at Waiau, near Pearl City

Location.- Sharp-crested weir, lat. 21°23'25", long. 157°57'40", on left bank of Waiau stream, a fifth of a mile downstream from Kamehameha Highway, 0.8 mile from Pearl City, and 8.5 miles northwest of Honolulu. Zero of gage is 0.74 foot below mean sea level. Records available.- May 1931 to June 1958. Extremes.- Not determined because extremes at gaging-station site are caused by changes in tidal backwater. Remarks.- Records excellent. Discharge for Aug. 7 to Sept. 14 interpolated. A small pumping plant diverts water above station for irrigation. Surface run-off caused by flood not included in figures of discharge given below.

Rating table, fiscal year 1937-38 ge height, in feet, and discharge, in million gallons a day) 2.0 6.0 2.1 7.9 2.2 99 2.3 12.1

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Map. Apr. May June

1 8.8 8.8 8.6 8.7 8.3 8.3 9.0 9.0 9.3 9.0 8.8 8.3 2 8.7 8.8 8.6 8.7 8.3 8.3 9.0 9.0 9.3 9.0 8.8 8.3 3 8.8 6.8 8.6 8.7 8.3 8.3 9.0 9.3 9.3 9.3 8.8 8.3 9 "* 9.3 8.7 8.3 4 8.8 6.8 8.6 8.5 8.5 8.3 9.0 9 "* 9.3 5 9.0 8.8 8.6 8.5 8.5 8.5 9.0 9.3 9.0 8.7 8.5 6 9.0 8.8 8.6 8.5 8.8 8.5 9.0 9.3 9.3 9.0 8.5 8.5 7 8.8 8.6 8.6 8.5 8.8 8.3 9.0 9.3 9.5 8.8 8.7 8.3 e 8.8 8.6 8.6 8.7 8.8 8.3 9.0 9.5 9.5 8.8 8.7 8.3 9 8.8 8.6 8.6 8.5 8.8 8.3 9.0 9.5 9.5 9.0 8.7 8.3 10 8.8 8.6 8.6 8.5 8.8 8.5 9.0 9.5 9.5 9.3 8.7 8.3 11 8.8 8.6 8.6 8.5 8.8 8.5 9.0 9.5 9.5 9.3 8.5 8.3 12 8.8 8.6 8.6 8.3 8.8 8.8 8.8 9.5 9.5 9.3 8.5 8.3 13 8.7 8.6 8.6 8.3 8.8 8.8 8.8 9.7 9.5 9.3 8.5 8.3 14 8.7 8.6 8.6 8.3 8.8 8.8 8.8 9.5 9.3 9.3 8.5 8.3 15 8.7 8.6 8.5 8.3 8.8 8.8 8.8 9.5 9.3 9.3 8.5 8.1 16 8.7 8.6 8.5 8.3 8.7 8.8 8.8 9.5 9.3 9.3 8.5 7.9 17 8.7 8.6 8.5 8.5 8.7 9.7 8.8 9.5 9.3 9.3 8.5 7.1 18 8.7 8.6 8.7 8.5 8.7 10.1 8.8 9.5 9.3 9.3 8.3 7.1 19 8.7 8.6 8.7 8.3 8.7 10.1 8.8 9.5 9.3 9.0 8.3 7.3 20 8.7 8.6 8.5 8.3 8.7 9.9 8.8 9.5 9.3 8.8 8.3 7.3 21 8.5 8.6 8.3 8.3 8.8 8.8 8.8 9.5 9.3 8.8 8.3 7.1 22 8.5 8.6 8.5 8.3 8.8 8.8 8.8 9.5 9.3 8.8 8.5 6.9 23 8.5 8.6 8.5 8.3 8.7 8.8 8.8 9.5 9.0 8.8 8.5 6.9 24 8.7 8.6 8.3 8.3 8.7 8.8 8.8 9.5 9.0 8.8 8.5 7.1 25 8.7 8.6 8.5 8.3 8.8 8.8 8.8 9.5 9.0 8.8 8.3 7.1 26 8.7 8.6 8.5 8.3 8.8 8.8 8.8 9.5 9.3 8.8 8.3 7.1 27 8.7 8.6 8.5 8.3 8.8 9.0 8.8 9.7 9.3 8.8 8.3 7.1 28 8.7 8.6 8.5 8.3 8.8 9.0 9.0 9.5 9.0 8.8 8.3 7.3 29 8.7 8.6 8.5 8.3 8.7 9.0 9.0 9.0 8.8 8.3 7.3 30 8.5 8.6 8.5 8.3 8.5 9.0 9.0 9.3 8.8 8.3 7.1 31 8.7 8.6 8.5 9.0 9.0 9.0 8.3

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 9.0 8.5 8.72 13.5 270 830 Augi 8.8 8.6 8.64 13.4 268 822 Sep 8.7 8.3 8.55 13.2 256 787 Oct 8.7 8.3 8.42 13.0 261 801 Nov 8.8 8.3 8.69 13.4 261 800 Dec 10.1 8.3 8.83 13.7 274 840 C alendar year 193 10.1 8.3 8.93 13.8 3,260 10, 000 Jan 9.0 8.8 8.90 13.8 276 846 Peb 9.7 9.0 9.44 14.6 264 811 Mar 9.5 9.0 9.29 14.4 286 884 Apr 11...... 9.3 8.8 9.02 14.0 271 831 May 8.8 8.3 8.50 13.2 263 808 Jun 8.5 6.9 7.75 12.0 232 713 Fiscal year 1937- 10.1 6.9 8.72 13.5 3,180 9,770 44 ISLAND OF OAHU

Pearl Harbor Springs at Kalauao, near Alea

Location.- Sharp-crested weir, lat. 21°23'00", long. 157°56'50", on left bank of Kalauao Stream, a quarter of a mile downstream from Honolulu Plantation pump 6, 1.1 miles from Alea, and 7.6 miles northwest of Honolulu. Zero of gage Is 1.10 feet below mean sea level. Records available.- March 1931 to June 1938. Extremes.- Not determined-because extremes at gaging station site are caused by changes in tidal backwater. Remarks.- Records excellent. Discharge for periods of missing gage heights, Mar. 25-28, Apr. 12 to May 7, June 7-15, computed on basis of records for all other stations on Pearl Harbor Springs. When water Is needed for Irrigation of sugarcane, Honolulu Plantation pump 6 diverts about 7 million gallons a day as a high-lift pump or 9 million gallons a day as a low-lift pump. Surface run-off caused by flood not In­ cluded in figures of discharge given below.

Rating table, fiscal year 1937-38 (gage height. In feet, and discharge, In million gallons a day) 1.9 8.1 2.2 18.7 2.4 27 2.0 11.3 2.3 23

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan, Peb. Mar. Apr. May June

1 14.9 22 15.6 14.9 15.6 16.0 22.5 22. £ 19.9 23.5 23.5 18.0 2 15.3 18.7 14.2 17.2 15.6 16.0 22.5 23 19.9 23 23.5 22,5 3 16.8 17.6 16.0 18.7 15.6 13.8 22. 5 23 19.5 23.5 23.5 22.5 4 21.5 18.4 18.7 14.5 15.6 18.0 22.5 23 19.5 23.5 23.5 23 5 19.9 22 22 14.5 21.5 19.5 18.4 23 19.9 19,1 19.1 23 6 15.3 22 22 14.2 21 14.2 17.6 23. E 23.5 20.5 18.7 18.7 7 14.9 22 16.4 16.0 21 15.6 15.6 23 20.5 23 20.5 18.7 8 14.9 22 15.6 15.6 21.5 16.0 17.6 22. E 23.5 19.1 21.5 18.7 9 14.9 16.4 18.0 18.0 21.5 14.5 22.5 23 23.5 21 18.7 18.7 10 16.0 16.0 18.0 19.1 21.5 16.0 18.0 23 21.5 23.5 21 18.7 11 21 16.0 16.0 14.9 21.5 16.0 15.6 23. E 21.5 23.5 19.1 19.5 12 16.0 16.0 21.5 14.9 21.5 22 17.6 23. E 21 23.5 17.6 22.5 13 16.4 16.0 18.0 14.5 21.5 21.5 15.6 24 23.5 23.5 19,9 18.0 14 14.9 18.0 16.8 15.3 21.5 21.5 16.0 24 22 23.5 19.9 18.0 15 14.9 19.5 16.8 16.8 22 22 17.6 24 19.5 23.5 23.5 18.0 16 14.9 14.5 16.0 16.4 20.5 22 21.5 24. E 19,5 23.5 19.5 18.7 17 16.8 16.8 15.6 20.5 14.9 22 16.4 25 20.5 23.5 20.5 18.4 18 19.5 17.2 16.0 13.8 16.0 22 16.4 25 21 18.7 17.2 18.7 19 14.9 15.6 20.5 15.6 16.8 22 16.0 25 23.5 18.0 17.2 21.5 20 15.6 14.9 14.5 16.8 19.1 16.8 16.0 25 24 18.7 17.6 17.2 21 16.8 16.4 14.5 14.2 19.5 14.9 16.4 25 22.5 18.7 22 17.6 22 16.0 19.5 16.0 16.8 14.2 16.4 17.6 20. E 22 18.0 22.5 17.6 23 15.3 14.2 16.0 14,2 15.3 16.8 21.5 20. E 19.9 18.7 18.7 16.8 24 16.8 14.5 15.6 20.5 15.3 16.4 19.9 20. E 20.5 23.5 18.0 17.2 25 21.5 14.9 16.0 16.0 21 22 19.5 20. £ 22 18.0 18.4 18.4 26 15.6 16.0 19.5 15.6 17.2 23 18.0 24 22 18.0 18.0 21.5 27 16.0 16.4 14.5 16.8 16.4 22 15.6 24 23.5 19.5 18.4 18.0 28 18.4 16.0 16.8 14.9 21.5 22 17.6 20. E 23.5 18.7 19.1 16.4 29 21.5 20.5 17.6 14.9 16.4 22.5 23 23.5 18,0 22.5 16.4 30 22 14.9 16.0 14.5 14.5 22.5 23 23.5 23.5 18.7 16.4 31 22 15.3 20.5 22.5 22.5 23.5 18.4

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-fee t Jul 22 14.9 17.1 26,5 531 1,630 Augi 22 14.2 17.4 26.9 540 1,660 Sop 22 14.2 17.0 26.3 511 1,570 Oct 20. £ 13.8 16.2 25.1 501 1,540 HOT 22 14.2 18.6 28.8 557 1,710 Dec 23 13.8 19.0 29.4 588 1,810 C alendar year 19, 24. E 13.8 18.8 29.1 6,860 21,070 Jan 23 15.6 18.8 29.1 583 1,790 Peb 25 20 . 5 23 . 2 35.9 648 1,990 Mar 24 19.5 21.7 33.6 674 2,070 Apr 23. E 18.0 21.1 32.6 634 1,950 May 23. E 17.2 20.0 30.9 620 1,900 Jun 23 16.4 19.0 29.4 569 1,750 P Iscal year 1937- 25 13.8 19,1 29.6 6,960 21,370 ISLAND OF OAHU 45

Moanalua Stream near Honolulu Location.- Sharp-crested weir and orifice control, lat. 21 023'30", long. 157°51'10", 54 miles upstream from mouth and 5.6 miles north of Honolulu post office. Concrete weir control was installed Dec. 9. Zero of gage is 339.12 feet above mean sea level. Drainage area.- 3.2 square miles. Records available.- June 1926 to June 1938. Average dischargeT- 12 years (1926-38), 2.72 million gallons a day (4.21 second-feet). Extremes.- Maximum discharge during year, 690 million gallons a day (1,070 second-feet) Apr. 9 (gage height, 6.10 feet), from rating curve extended above 62 million gallons a day based on weir formulas; no flow for several periods during year. 1926-38: Maximum discharge, 2.370 million gallons a day (3,670 second-feet) Nov. 18, 1930 (gage height, 11.58 feet), from rating curve extended above 40 million gallons a day based on weir formulas; no flow in dry weather. Remarks.- Records good except those for period of missing gage heights, Nov. 19-23 (computed on basis of records for stations on nearby streams), and those for construc­ tion period, May 25 to June 11 (computed on basis of several daily readings of staff gage) which are poor. Continuous records of rainfall are obtained at station.

Rating tables, fiscal year 1937-38 ge height, in feet, and discharge, In million gallons a day) July 1 to Dec. Dec. 9 to June 30 0.7 1.06 1.0 5.6 1.0 6.8 .19 .75 1.12 1.5 24 1.2 11.1 .52 .8 1.47 2.0 33 24.5 .94. .9 3.2 2.5 93 1.70 2.0 45 3.75 2.5 82

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0 0.21 0.06 0.08 0.91 0.07 4.8 10.3 0.02 1.21 0 8.8 2 0 13.9 .04 .04 12.8 .04 2.55 45 .01 .42 1.31 14.0 3 0 7.7 .02 .03 .70 .03 1.49 50 .01 .22 1.68 3.9 4 0 1.21 .01 .02 4.4 1.93 .90 4.8 0 .08 2.15 2.4 5 0 .75 0 0 12.6 .41 .58 16.3 0 .03 .45 1,7 6 u .35 0 0 9.5 .06 .36 3.15 0 34 1.15 .74 7 0 .15 1.27 0 2.6 .03 .48 1.56 3.95 6.6 .59 .53 8 0 .06 2.0 0 3.2 .02 3.35 1.42 9.2 2.55 .06 .48 9 0 .04 .34 0 1.16 .01 1.06 1.21 1.2 63 8.4 .48 10 0 .04 .05 0 .96 .01 .28 21 1.05 46 2.3 1.97 11 0 .03 .36 0 2,1 .32 .13 12.9 .59 15.6 .53 6.6 12 0 .03 1.98 0 .88 59 .05 3.05 .12 5.7 .22 3.3 13 0 .02 .40 0 .30 3.4 .03 12.0 .39 3.8 5.8 .95 14 0 .01 .06 .85 .12 1.56 .02 3.05 6.0 3.0 3.75 3.85 15 0 .95 .03 .24 /06 4.3 .01 2.35 1.7 1.5G 1.38 .90 16 0 15.9 .01 .04 .05 1.24 .01 1.21 .69 1.00 .39 .36 17 9.3 12.1 .01 .02 .04 .45 .01 .64 14.4 .58 .13 .16 18 .41 1.12 .01 .01 .02 .34 .01 .42 17.4 .34 .04 .08 19 .02 .57 0 .01 .01 .15 0 .28 15.0 .19 .03 1.31 20 .93 .22 0 0 .01 .05 0 .16 3.2 .13 23.5 .21 21 6.5 .07 0 0 0 .02 0 .09 1.35 .06 87 .03 22 1.19 .04 0 0 0 .02 0 .04 .53 .03 7.0 .02 23 .73 .04 0 0 0 32 0 .03 .28 .01 2.8 .01 24 .25 .03 0 .41 4.6 6.3 1.48 .03 .09 .01 1.7 .01 25 9.0 .02 0 1.00 79 22.5 1.78 .05 .11 .01 3.3 .02 26 1.7 .02 4.4 .04 2.4 23.5 .29 .05 .30 .01 9.3 .01 27 4.9 .01 9.4 .01 1.47 5.8 7.2 .03 35.5 .01 4.2 .01 28 1.56 .48 24.5 .01 .90 2,55 33 .02 11.4 0 1.96 .01 29 4.5 .34 .98 0 .42 51 7.4 6.9 0 2,05 0 30 .94 3.8 .36 0 .16 44 8.6 8.1 0 3.7 0 31 .38 .51 0 12.4 2.55 3.5 1.87

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 9.3 0 1.36 2.10 42.3 130 Auff 15.9 .01 1.96 3.03 60.7 186 8ep 24.5 0 1.54 2.38 46.3 142 Oct 1.00 0 .091 .141 2.81 8.6 Hov 79 0 4.71 7.29 141 434 Dec 59 .01 8.82 13.6 274 839 C alendor year 193 95 0 4.11 6.36 1,500 4,600 Jan 33 0 2.53 3.91 78.4 241 Feb 50 .02 6.83 10.6 191 587 Mar 35.5 0 4.61 7.13 143 439 Apr 63 0 6.20 9.59 186 571 May 87 0 5.77 8.93 179 549 Jun 14.0 0 1.76 2.72 52.8 162 Fiscal year 1937-38 ...... 87 0 3.83 5.93 1,400 4,290 ISLAM) OF OAHU

Kalihi Stream near Honolulu Location.- Lat. 21°22'10", long. 157°50'25", at Kiol Pool, three-eights of a mile up- stream from Catholic Orphanage and 4.4 miles north of Honolulu post office. Zero of gage is 464.40 feet above mean sea level. Drainage area.- 2.7 square miles. Records available.- September 1913 to. June 1938. Average discharge?- 21 years (1916-20, 1921-38), 5.83 million gallons a day (8.09 second- feet). Extremes.- Maximum discharge during year, 832 million gallons a day (1,290 second-feet) Sept. 28 (gage height, 8.84 feet), from rating curve extended above 220 million gallons a day (2.12 second-feet) July 2. 1913-38: Maximum discharge, 10,900 million gallons a day (16,900 second-feet) Nov. 18, 1930 (gage height, 13.81 feet), from rating curve extended above 220 million gallons a day by test on model of station site; minimum, 0.06 million gallons a day (0.09 second-foot) Oct. 22, 1933. Remarks.- Records excellent except those for periods when clock was not running, Oct. 21 to Nov. 24, Nov. 27 to Dec. 1, which were computed on basis of records for stations on streams from the Waiomao to the Kalihi and are poor. Water for domestic use diverted from stream above station.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day) 0.8 0.60 1.7 3.0 1.0 2.2 2.0 3.5 1.2 5.1 2.3 30.5 4.0 1.4 8.7 2.6 40

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 1.46 3.3 2.2 3.0 5.3 2.3 10.6 24 2.2 5.1 3.0 14.3 2 1.64 25 2.1 2.6 12.0 2.2 8.1 37 2.1 4.3 5.7 28.5 3 1.73 8.7 2.0 2.45 4.0 2.2 6.6 44 2.0 4.0 3.8 7.9 4 6.0 4.9 2.35 4.7 3.4 3.25 5.8 7.8 2.55 3.35 5.5 6.3 5 4.4 4.5 2.0 2.9 8.0 2.2 5.1 19.5 2.1 4.2 3.25 5.3 6 2.45 3.5 2.2 2.35 5.2 2.0 4.5 6.3 16.1 53 6.2 4.8 7 5.0 3.25 5.2 2.1 4.3 1.91 5.9 4.9 8.4 10.0 3.1 4.3 8 2.6 2.85 3.6 5.4 3.8 1.91 8.5 5.8 21 5.4 2.85 4.1 9 2.0 2.85 2.45 2.35 3.5 1.82 4.8 4.6 4.5 82 20.5 4.5 10 1.82 3.05 2.35 2.1 3.3 1.73 3.8 26.5 4.8 42 7.2 8.6 11 1.82 2.45 10.1 2.0 4.2 3.1 3.5 10.6 3.25 15.5 4.3 30.5 12 1.73 3.45 7.4 1.91 3.5 40 3.5 6.1 2.85 12.4 -6.8 7.8- 13 1.55 3.75 3.5 4.3 3.2 4.0 3.1 19.0 6.4 8.1 13.0 5.1 14 2.3 2.85 2.7 8.1 3.0 4.1 3.0 6.0 9.0 7.2 17.3 13.2 15 1.64 23 2.35 3.65 2.8 7.9 2.7 6.2 6.0 5.8 5.8 5.3 16 1.64 28 2.2 3.0 2.65 3.5 2.6 4.6 3.8 5.1 4.3 4.3 17 21 12.1 2.1 2.7 2.55 3.0 2.7 4.0 16.0 4.5 3.5 3.8 18 3.0 5.3 2.0 3.1 2.45 2.7 2.6 4.0 11.8 4.1 3.1 3.5 19 2.1 4.3 2.0 2.6 2.4 2.35 2.35 3.5 15.3 3.8 3.5 3.35 20 2.85 3.5 1.82 2.35 2.3 2.2 2.45 3.1 5.6 3.35 44 3.0 21 5.1 3.25 1.82 2.25 2.25 2.1 2.35 3.0 4.3 3.25 95 2.85 22 3.1 3.85 1.73 2.2 2.2 2.2 2.2 2.7 3.5 3.0 11.6 2.7 23 2.7 2.7 3.5 2.3 2.2 31 2.15 2.7 3.25 2.85 7.6 2.45 24 2.5 2.6 1.91 3.3 9.0 12.0 4.4 3.6 3.0 2.7 5.8 2.85 25 10.3 3.15 3.45 3.1 64 17.5 2.1 2.85 3.25 2.6 43 2.45 26 4.0 2.45 13.2 2.7 5.8 27 2.9 2.45 2.85 2.85 21.5 2.2 27 9.1 2.35 56 2.5 3.3 10.7 e.o 2.45 36.5 2.35 7.8 2.2 28 4.9 2.6 26.5 2.4 2.7 15.3 24 2.35 15.6 2.2 6.6 2.2 29 9.2 2.35 4.6 2.3 2.4 60 7.9 9.1 2.1 7.4 2.1 30 4.3 6.7 3.5 2.5 2.2 53 8.0 10.2 2.2 10.2 2.1 31 3.5 2.7 2.7 20.5 4.6 8.0 10.5

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 21 1.46 4.11 6.36 127 391 Aug 28 2.35 5.95 9.21 184 566 Sep 56 1.73 5.96 9.22 179 549 Oct 8.1 1.91 2.96 4.58 91.9 282 HOT 64 2.2 9.18 178 546 Dec 60 1.73 11.2 17.3 346 1,060 C alendar year 193 121 1.46 7.76 12.0 2,830 8,690 Jan 24 2.1 5.19 8. 03 161 493 Peb 44 2.35 9.63 14.9 270 827 Mar 36.5 2.0 7.91 12.2 245 753 Apr 82 2.1 10.3 15.9 309 949 May 95 2.85 12.7 19.6 394 1,210 Jun 30.5 2.1 6.42 9.93 193 591 Placal year 1937- 95 1.46 7.34 11.4 2,680 8,220 ISLAND OF OAHU 47

Nuuanu Stream below reservoir 2 wasteway, near Honolulu Location.- Sharp-crested weirs, lat. 21°20'55", long. 157°49'40", on Pali Road in upper Nuuanu Valley, a quarter of a mile downstream from reservoir 2 wasteway and 3.5 miles from Honolulu post office. Zero of gage Is 631.71 feet above mean sea level. Drainage area.- 3.4 square miles. Records available.- October 1913 to June 1938. Average discharge.- 19 years (1917-20, 1922-38), 5.89 million gallons a day (9.11 second- feet). Extremes.- Maximum discharge during year, 333 million gallons a day (515 second-feet) sept. 28 (gage height, 4.70 feet); minimum, 1.88 million gallons a day (2.91 second- feet) Oct. 28, 29. 1913-38: Maximum discharge, 1,600 million gallons a day (2,480 second-feet) Jan. 16, 1921 (gage height, 8.74 feet, from floodmarks), from rating curve extended above 300 million gallons a day based on weir formulas: minimum, 0.06 million gallons a day (0.09 second-foot) Sept. 10, 11, 1925. . Remarks.- Records excellent except those for periods of missing gage heights, Nov. 6-24, Mar. 27-29, which were computed on basis of records for stations on all other streams between the Waiomao and the Kalihi and are poor. Reservoirs 2, 3 and 4 (capacities, 21, 34, and 1,630 acre-feet, respectively) regulate flow. Board of Water Supply di­ verts ground water from tunnels in drainage area.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons

1.65 2.0 2.1 2.5 2.6 1.2 3.1 1.5

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 6.1 4.6 3.05 6.5 5.3 3.2 9.9 8.3 4.8 5.4 6.3 18.4 2 6.3 18.3 3.0 6.6 11.8 3.15 8.8 17.6 4.6 4.4 7.9 51 3 5.7 8.6 2.9 3.0 4.3 3.1 8.3 26.5 4.5 4.6 6.5 14.2 4 6.7 5.4 3.1 3.15 3.9 3.95 7.9 7.0 4.4 4.6 8.8 11.3 5 6.5 5.2 2.95 3.0 8.0 4.6 7.4 15.1 4.2 5.7 6.1 10.2 6 7.1 4.8 3.0 2.6 6.0 3.S 7.2 7.0 8.2 52 6.3 12.9 2.95 7.6 6.5 10.0 10.1 5.6 12.3 8 6.1 4.5 3.65 2.35 4.2 3.65 8.7 6.8 17.7 6.6 5.6 10.2 9 5.6 4.4 3.0 2.2 3.8 3.1 7.2 6.5 5.6 55 15.2 9.9 10 5.6 3.35 2.9 2.1 3.5 2.65 6.5 13.6 5.2 28.5 7.9 11.5 11 5.6 2.85 5.0 2.05 5.0 2.7 6.5 10.4 4.6 12.9 6.3 36 12 5.6 3.0 5.6 2.6 3.7 12.6 6.3 7.2 4.5 12.4 6.7 30.5 13 5.2 3.1 3.15 4.6 3.4 3.75 6.1 16.8 5.6 9.6 11.1 12.6 14 5.6 3.2 3.0 6.1 3» 2 3.6 5.9 7.4 5.6 8.8 10.2 9.4 15 4.8 5.1 2.95 3.4 3.0 5.4 5.7 7.1 4.8 8.3 7.0 9.1 16 5.4 7.9 2.9 3.1 2.9 3.5 5.6 6.5 4.4 8.1 6.3 8.6 17 14.4 10.9 2.8 2.9 2.8 3.4 5.6 6.3 6.6 7,6 6.1 8.1 18 5.9 4.3 2.75 siis 2.7 3.25 5.6 6.3 6.8 7.6 5.9 7.9 19 5.6 3.95 2.75 2.9 2.6 3.15 5.4 5.9 17.5 7.4 7.2 7.9 20 5.7 3.65 2.9 2.85 2.5 3.15 5.4 5.7 5.4 7.2 21.5 7.2 21 6.7 3.55 3.55 2.85 2.45 3.1 5.2 4.9 4.6 7.0 66 7.9 22 5.9 3.5 3.55 2.8 2.4 3.4 5.0 5.0 4.4 6.7 12.3 7.2 23 5.9 3.55 4.3 2.8 2.35 21.5 5.1 5.6 4.3 6.5 9.9 7.2 24 5.6 3.25 4.1 3.5 9.0 10.1 7.5 5.7 4.2 6.5 9.1 7.2 25 7.3 3.3 6.1 3.3 17.7 7.8 5.2 5.6 4.2 6.5 24 6.5 26 5.7 3.1 6.4 2.8 4.1 27 7.5 4.6 4.0 6.3 28.5 7.2 27 8.1 3.1 7.2 2.7 3.75 8.3 11.7 4.8 30 5.7 10.5 7.0 28 6.3 3.25 39.5 2.5 3.4 12.0 20 4.8 14.0 5.7 9.6 7.4 29 8.2 3.1 6.1 2.2 3.2 33 9.3 9.0 5.6 9.4 7.3 30 5.6 5.1 5.7 2.5 3.15 34 8.6 6.2 5.9 12.2 5.7 31 4.8 3.3 2.7 14.0 6.7 5.6 10.2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 14.4 4.8 6.37 9.86 197 606 Aug 18.3 2.85 4.86 7.52 151 463 Sep 39.5 2.75 5.04 7.80 151 464 Oct 6.6 2.05 3.16 4.89 97.9 300 HOT 17.7 2.35 4.63 7.16 139 426 Dec 34 2.65 8.15 12.6 253 775 C alendar year 19' 156 2.05 10.8 16.7 3,940 12,090 Jan 20 6.0 7.40 11.4 229 704 Peb 26.5 4.6 S.41 13.0 236 723 Mar 30 4.0 7.27 11.2 226 692 Apr 55 4.4 11.0 17.0 329 1,010 May 66 5.6 11.8 18.3 366 1,120 Jun 51 6.7 12.3 19.0 370 1,130

P iscal year 1937- 66 2.05 7.52 11.6 2,740 8,410 48 ISLAND OF OAHU

West Branch of Manoa Stream near Honolulu Location.- Combination Parshall flume^and concrete weir control, lat. 21°19'50", long. 157U48'15", 75 feet upstream from lower highway and 4 miles northeast or Honolulu POST; office. Zero of gage is 290.84 feet above mean sea level (Board of Water Supply bench mark). Record! ^available'.- August 1925 to June 1938. May 1913 to January 1921 at site 200 feet Averagerdlscharge.- 19 years (1913-20, 1926-38), 2.94 million gallons a day (4.55 second- Extremes!- Maximum discharge during year, 374 million gallons a day (579 second-feet) Apr. 9 (gage height, 3.91 feet), from rating curve extended above 33 million gallons a day by test on model of station site; minimum, 0.51 million gallons a day (0.79 second- 1913-21, 1925-38: Maximum gage height, 10.4 feet, Jan. 16, 1921, at former site and datum, from floodmarks (discharge, 2,100 million gallons a day or 3,250 second- feet, estimated), from rating curve extended above 40 million gallons a day; minimum discharge, about 0.05 million gallons a day (0.08 second-foot) Mar. 16, £Z, I9

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, In million gallons a day)

0.25 3.2 1.2 15.8 .62 5.6 1.4 23 l.VO 9.7 1.6 32

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.71 1.92 1.11 0.96 13.3 0.91 4.0 4.6 0.96 1.70 2.25 9.5 2 1.24 22.5 1.06 .91 6.8 .86 3.05 5.4 .86 1.52 3.5 29 3 1.28 7.6 1.01 .86 2.35 .82 2.5 13.9 .82 1.75 2.4 5.8 4 4.6 4.5 3.1 1.73 1.99 1.01 2.15 2.8 .86 1.35 4.9 3.8 5 3.35 4.2 1.29 2,45 3.7 .77 1.92 8.8 1.14 2.4 2.15 2.9 6 4.9 2.7 1.60 .96 2.85 .72 1.7 2.6 3.8 21 2.35 2.5 7 3.35 2.6 6.2 .77 2.25 .72 2.65 2.0 6.0 6.2 1.35 2.3 8 1.70 1.92 4.8 2.2 1.64 .67 3.1 2.8 8.6 2.9 1.11 £.4 9 1.29 2.05 2.25 .82 1.70 .67 1.70 2.15 2,5 29.5 8.2 2.95 10 1.11 4.0 1.52 .72 1.58 .67 1.40 4.4 2.25 20 3.95 10.7 11 1.11 1.85 7.9 .67 2,4 .62 1.29 3.65 1.52 6.3 2.1 20.5 12 1.17 2.45 6.3 .58 1.40 11.4 1.23 1.92 1.80 7.2 5.1 6.2 13 .86 3.0 2.5 10.7 1.17 1.78 1.11 6.3 3.85 4.5 7.8 3.4 14 .86 3.15 1.70 6.3 1.11 3.25 1.01 2.15 4.3 4.6 3.6 3.7 15 .86 7.7 1.52 2.55 1.06 5.3 .96 2.35 3.4 3.0 2.15 2.7 16 1.13 6.7 1.46 1.70 1.01 2.1 .91 1.52 2.4 2.5 1.78 2.2 17 15.3 10.8 1.29 1.40 1.01 1.58 .96 1.35 4.4 2.15 1.64 2.1 18 2.3 2.8 1.11 1.40 1.01 1.35 .96 1.52 5.9 1.85 1.46 2.0 19 1.46 2.15 1.84 1.11 .96 1.06 .82 1.35 8.5 1.70 2.1 1.64 20 2.05 1.92 1.06 1.01 .96 1.01 1.62 1.23 3.5 1.52 9.9 1.46 21 3.3 1.78 .91 1.01 1.01 .91 1.36 1.11 2.5 1.40 28.5 1.35 22 3.2 1.58 1.01 1.01 .82 .98 .91 1.06 2.1 1.35 4.2 1.23 £3 2.55 1.46 1.36 1.68 .77 12.5 .77 1.06 2.15 1.40 2.7 1.23 £4 l.VO 1.40 .91 2.05 8.6 3.1 2.45 1.28 1.64 1.17 2.3 1.40 £5 5.4 2.5 1.64 1.37 7.2 2.15 .86 1.29 1.64 1.06 25.5 1.17 26 2.4 1.35 4.1 .91 2.1 18.8 2.85 1.06 1.40 1.58 13.4 1.06 27 3.9 1.29 8.0 .86 1.70 4.2 7.3 1.01 14.8 1.01 4.1 1.06 £8 2.2 2.25 2.0 .77 1.23 4.2 10.3 1.01 6.0 .91 4.0 1.35 29 5.9 1.40 1.11 .77 1.06 15.6 4.5 3.3 .91 5.7 1.29 30 2.2 2.55 .96 .82 .96 20 3.05 2.3 1.11 7,4 1.63 31 1.78 1.35 .96 7.4 2.55 1.92 4.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 15.3 0.71 2.75 4.25 85.2 261 AugiJsi:::::::::::::::::::::::::: 22.5 l.£9 3.72 5.76 115 354 Sep 8.0 .91 2.42 3.74 72.6 233 Oet 10.7 .58 1.68 2.60 52.0 160 HOT 13.3 .77 2.52 3.90 75.7 232 Dec 20 .62 4.10 6.34 1£7 390 0 alendar year 193 40 .58 3.63 5.62 1,3£0 4,060 Jan 10.3 .77 £.32 3.59 71.9 221 Feb 13.9 1.01 2.92 4.52 81.7 251 Mar 14.8 .82 3.46 5.35 107 329 Apr 29.5 .91 4.52 6.99 136 416 May 28.5 1.11 5.54 8.57 172 527 Jun 29 1.06 4.35 6,73 131 401 P Lseal year 1937-38 ...... 29.5 .58 3.36 5.20 1,230 3,760 ISLAM) OF OAHU 49

East Branch of Manoa Stream near Honolulu Location.- Combined Parshall flume and concrete weir control, lat. 21 019'50", long. 157"48'10", just downstream from highway bridge, 400 feet upstream from confluence with West Branch, and 4 miles northeast of Honolulu post office. Zero of gage is 294.50 feet above mean sea level (Board of Water Supply bench mark). Drainage area.- 1.0 square mile. Records available t- May 1913 to January 1921, August 1925 to June 1938. Average dlschargeT- 19 years (1913-20, 1926-38), 3.10 million gallons a day (4.80 second-feet). Extremes.- Maximum discharge during year, 281 million gallons a day (435 second-feet) Dec. 23 (gage height, 3.96 feetT, from rating curve extended above 15 million gallons a day by test on model of station site; minimum, 1.93 million gallons a day (2.99 second-feet) Dec. 10. 1913-21, 1925-38: Maximum gage height, 10.4 feet, Jan. 16, 1921, at former site and datum, from floodmarks (discharge, 2,000 million gallons a day or 3,090 second- feet, estimated), from rating curve extended above 37 million gallons a day; minimum discharge, 0.4 million gallons a day (0.6 second-foot) June 7, 8, 1926. Remarks.- Records good except those for periods of missing gage heights, July 11-30, Mar. 25, May 21 to June 21, which were computed on basis of records for station on West Branch of Manoa Stream and are poor. East Manoa ditch diverts water from stream about 1,500 feet above station. Board of Water Supply diverts ground water from tun­ nels in drainage area.

Bating table, fiscal year 1937-36 (gage height, In feet, and discharge, in million gallons a day) 0.4 1.86 1.0 8.1 1.6 19.5 .6 3.55 1.2 10.9 1.8 26 5.6 1-4 14.8 2.0 35

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 4.4' 1 3.15 3.75 3.1 2.65 12.9 2.25 5.4 5.2 2.5 4.5 12.5 2 3.8 13.1 3.1 2.65 7.5 2.15 4.5 5.8 e.4 3.95 5.4 29 3 3.5 7.1 2.9 2.65 4.0 2.15 4.1 11 .3 2.5 3.85 4.4 8.5 4 6.7 5.1 7.0 3.0 3.85 2.15 3.95 3.85 2.55 3.45 6.1 6.0 6 5.0 4.9 3.1 3.7 4.7 £.1 3.65 7.9 2.8 4.6 4.0 5.2 6 4.2 3.95 3.75 2.75 4.5 2.1 3.55 3.65 12.4 22 4.9 4.5 7 4.0 4.4 9 .2 2.65 3.55 2.0 4.9 3.2 10.1 6.6 3.75 4.2 8 3.35 3.55 6.5 4.4 3.45 e.o 5.3 3.65 13.1 4.7 3.75 4.3 9 3.1 3.65 3.95 2.75 3.55 e.o 3.75 3.35 4.5 27.5 14.6 5.0 10 3.0 4.6 3.85 2.65 3.2 2.0 3.55 4.5 4.9 21.5 6.2 13.0 11 2.9 3.45 11.1 2.65 3.2 2.0 3.45 4.2 3.65 S.8 4.4 20 12 g O 4.1 7.0 2.65 2.75 9.5 3.55 3.3 4.5 10.0 7.5 8.0 13 2 »9 4.8 4.3 10.1 2.55 2.55 3.45 6.0 5.S 6.6 10.3 6.0 14 2.9 3.8 3.95 7.0 2.4 4.2 3.35 3.45 6.0 6.1 6.0 6.0 15 g .9 9.1 3.75 3.9 2.35 5.7 3.3 3.3 6,1 4.3 4.7 5-5 16 3.5 10.4 3.65 3.2 2.35 2.75 3.2 3.0 5.2 4.1 4.2 5.1 17 15.0 7.3 3.35 3.0 2.25 2.65 3.3 2.85 7.3 4.0 3.95 4.8 18 6.0 4.3 3.3 2.9 2.25 2.55 s.e 3.1 8.8 3.95 3.65 4.5 19 4.0 3.85 3.7 2.75 2.25 2.25 2.85 2.S5 9.2 3.85 4.3 4.3 20 4.5 3.55 »3.35 2.66 2.35 2.35 3.3 2.75 6.2 3.85 *16.8 4.2 21 6.0 3.45 *3.2 2.75 2.5 2.15 2.75 2.65 5.3 3.75 28 4.1 22 5.5 3.2 *3.2 3.2 2.25 2.15 2.55 2.65 5.0 3.75 8.0 4.0 23 4.2 3.2 *3.35 5.4 2.15 10.9 2.5 2.65 4.9 3.85 5.5 4.0 24 4.0 3.45 2.9 5.8 8.1 4.3 3.4 2.75 *4.6 3.55 5.0 4.0 26 7.5 4.2 3.2 4.1 5.6 3.55 2.4 2.65 4.3 3.65 25 3.95 26 4.5 3.2 5.1 2.85 2.65 12.5 3.2 2.5 *4.2 4.0 13.5 3,85 27 5.5 3.0 4.9 2.75 2.65 5.0 4.8 2.5 17.6 3.45 6.0 3.85 28 4.3 4.7 3.7 2.75 2.4 5.5 7.0 2.55 8.1 3.45 5.5 3.95 29 8.0 3.3 2.S5 2.65 2.25 16.9 5.8 6.9 3.45 s.o 3.95 30 4.6 5.2 2.65 2.65 2.25 19.9 4.4 4.8 3.85 10.0 4.1 31 3.95 3.3 3.1 8.3 3.65 4.9 6.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 15.0 2.9 4.65 7.19 144 443 Aug 13.1 3.0 4.80 7.43 149 457 Sop 11.1 2.65 4.30 6.65 129 396 Oct 10.1 2.65 3.50 5.42 109 333 Nov 12.9 2.15 3.62 5.60 109 334 Dec 19.9 2.0 4.79 7.41 149 456 0 alendar year 19* 7 ...... 30 2.0 4.98 7.71 1,820 5,580 Jan 7.0 2.4 3.81 5-89 118 362 Feb 11.8 2.5 3.88 6.00 109 333 Mar 17.6 2.4 6.16 9.53 191 586 Apr 27.5 3.46 6.50 10.1 196 598 May 28 3.65 7.86 12.2 244 748 June ...... 29 3.85 6.6S 10.3 200 615 F Lscal year 1937- 29 2.0 5.05 7. SI 1,850 5,660 Partly estimated. 50 ISLAND OF OAHU

East Manoa ditch near Honolulu

Location.- Parshall flume, lat. 21°19'50", long. 157°48'05", 150 feet east of lower highway and gaging station on East Branch of Manoa Stream and 4 miles northeast of Honolulu post office. Zero of gage is 317.09 feet above mean sea level (Board of Water Supply bench mark). Records available.- May 1915 to December 1916, January 1918 to January 1921, August 1925 to June 1938. Average discharge.- 12 years (1926-38), 0.675 million gallons a day (1.04 second-feet). Extremes.- Maximum discharge during year, 4.0 million gallons a day (6.2 second-feet) Aug. a (gage height, 0.85 feet); minimum, 0.03 million gallons a day (0.05 second- foot) Jan. 16-19. 1915-16, 1918-21, 1925-38: Maximum discharge, about 26 million gallons a day (40 second-feet) Jan. 16, 1921 (gage height, 2.27 feet, former datum); no flow Aug. 26, 1927. Remarks.- Records poor. Ditch diverts water from East Manoa Stream about a quarter of a mile above station by means of crude stone dam. Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 0.11 0.04 0.10 0.06 0.18 0.13 0.15 o.oe 0.10 0.04 0.10 0.06 2 .10 .50 .08 .06 .13 .13 .10 .1C .10 .08 .10 .25 3 .10 .20 .08 .06 .06 .13 .05 .22 .08 .11 .10 .08 4 .17 .06 .15 .06 .06 .13 .05 .10 .08 .11 .11 .05 e .15 .06 .08 .06 .06 .13 .05 .13 .10 .13 .10 .05 6 .13 .05 .08 .06 .06 .13 .05 .10 .21 .38 .11 .05 7 .13 .05 .29 .06 .06 .13 .06 .11 .17 .10 .10 .05 8 .11 .05 .17 .06 .06 .13 .06 .11 .34 .05 .OS .05 9 .11 .05 .08 .06 .06 .11 .05 .10 .08 .37 .22 .05 10 .11 .05 .06 .05 .13 .11 .05 .13 .05 .51 .11 .10 11 .11 .04 .20 .05 .19 .10 .05 .13 .05 .15 .08 .19 12 .10 .04 .13 .05 .19 .33 .05 .11 .05 .17 .12 .10 13 .10 .09 .06 .11 .17 .15 .05 .IV .06 .10 .12 .05 14 .10 .17 .06 .10 .17 .19 .05 .13 .05 .10 .08 .05 15 .08 .34 .13 .06 .17 .27 .05 .13 .05 .08 .05 .05 16 .11 .27 .13 .05 .17 .15 .04 .13 .04 .06 .05 .05 17 .21 .30 .13 .05 .17 .13 .03 .11 .06 .05 .05 .06 18 .06 .19 .13 .06 .17 .15 .03 .13 .08 .05 .05 .05 19 .05 .17 .13 .06 .17 .13 .11 .11 .11 .05 .05 .05 20 .05 .17 .11 .05 .17 .13 .21 .11 .05 .05 .13 .05 21 .06 .17 .11 .06 .19 .11 .19 .11 .04 .05 .60 .05 22 .05 .15 .11 .05 .17 .11 .19 .11 .04 .06 .10 .05 23 .05 .15 .11 .06 .15 .23 .19 .10 .04 .10 .06 .05 24 .05 .13 .10 .06 .39 .10 .19 .10 .04 .10 .05 .05 25 .07 .15 .10 .06 .30 .08 .17 .10 .04 .08 .27 .05 26 .05 .13 .11 .06 .15 .56 .17 .10 .04 .10 .25 .05 27 .06 .11 .10 .06 .15 .17 .19 .10 .14 .08 ;06 .05 28 .05 .13 .08 .06 .13 .11 .21 .10 .06 .08 .06 .05 29 .09 .11 .08 .06 .13 .53 .11 .06 .08 .05 .05 30 .04 .13 .08 .06 .13 .64 .10 .05 .08 .05 .05 31 .04 .11 .06 .27 .06 .04 .05

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 0.21 0.04 0.090 0.139 2.80 8.6 Aug .34 .04 .141 .218 4.36 13 Sep .29 .06 .112 .173 3.36 10 Oct .11 .05 .061 .094 1.88 5.8 HOT .39 .06 .150 .232 4.49 14 Dec .64 .08 .190 .294 5.90 18 C alendar year 19C 1.48 .04 .170 .263 62.0 189 Jan .21 .03 .100 .155 3.11 9.5 Fsb .22 .08 .116 .179 3.26 10 Mar .34 .04 .081 .125 2.50 7.7 Apr .51 .04 .118 .183 3.55 11 May .60 .05 .113 .175 3.51 11 Jun .25 .05 .066 .102 1.99 6.1 Placal year 1937- .64 .03 .112 .173 40.7 125 ISLAND OF OAHU 51

Pukele Stream near Honolulu Location.- Concrete weir control, lat. 21°19'15", long. 157°47'10", 200 feet upstream from bridge on Palolo Belt Road, five-eighths of a mile upstream from confluence with Waiomao Stream, and 4f miles east of Honolulu post office. Zero of gage is 344.78 feet above mean sea level (Board of Water Supply bench mark), Drainage area.- 1.2 square miles. Records available.- June 1926 to June 1938. April 1912 to September 1913, at site up- stream from present site and just downstream from Mahoe Springs. Average discharge.- 12 years (1926-38), 1.63 million gallons a day (2.52 second-feet). Extremes.- Maximum discharge during year, 336 million gallons a day (520 second-feet) Apr. 9 (gage height, 4.71 feet), from rating curve extended above 15 million gallons a day by test on model of station site; minimum, 0.24 million gallons a day (0.37 second-foot) Dec. 11. 1912-13, 1926-38: Maximum discharge, 1,680 million gallons a day (2,600 second- feet) Apr. 11, 1930 (gage height, 7.75 feet, from floodmarks), from rating curve ex­ tended above 14 million gallons a day by test on model of station site; minimum, 0.09 million gallons a day (0.14 second-foot) Dec. 7-13, 20, 21, 1933. Remarks.- Records good except those for periods of faulty gage heights, Sept. 20-23, Oct. 19 to Nov. 1, June 29, 30, which were computed on basis of records for stations on all other streams between the Waiomao and Kalihi and are poor. A 2-inch pipe di­ verts water from stream above station.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 1.0 0.08 1.5 2.7 2.2 19-0 1.1 .28 1.6 3.9 2.4 27 1.2 .60 1.7 5.5 2.6 36 1.3 1.10 1.8 7.4 2.S 48 1.4 1.76 2.0 12.5 3.0 60

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June 1 0.50 0.70 0.57 0.41 5.5 0.38 2.7 1.23 0.60 1.17 0 .85 2.7 2 .50 6.8 .57 .41 2.1 .38 1.85 1.56 .57 1.00 1 .05 12.1 3 .50 3.45 .57 .41 .75 .34 1.50 11.8 .57 1.05 1 .06 2.5 4 .87 1.17 1.54 .41 .57 .31 1.36 1.43 .54 1.00 2 .15 1.76 5 1.20 1.82 .57 .51 .57 .28 1.30 12.2 .54 1.62 1 .30 1.50 6 .47 .90 .54 .38 .75 .?.S 1.23 1.85 3.95 34.5 1 .16 1.43 7 .76 .90 3.1 .38 .60 .28 1.23 1.30 3.1 5.2 .95 1.36 8 .47 .85 2.8 .44 .60 .26 2.45 1.17 8.5 2.25 .95 1.30 9 .47 .85 1.00 .38 .78 .26 1.17 1.10 1.63 24.5 15 .6 1.69 10 .47 .95 .75 .34 .65 .26 1.05 1.23 1.37 18.0 3 .95 7.4 11 .47 .80 3.3 .34 .83 .26 .95 1.23 .90 4.4 1 .50 13.8 12 .44 .80 2.9 .34 .65 5.5 .90 1.05 .80 5.3 3 .95 3.8 13 *.44 .75 1.00 4.3 .65 .57 .85 3.55 1.67 3.45 S .7 1.85 14 *.44 1.01 .85 3.85 .60 .56 .85 1.43 1.23 2.9 2 .05 1.63 15 *.44 1.77 .85 .90 .54 2.55 .80 3.55 1.05 1.95 1 .36 1.43 16 .44 3.1 .85 .44 .50 .65 .75 1.23 .95 1.69 1 .10 1.23 17 3.65 7.4 .S5 *.41 .50 .50 .70 1.00 2.3 1.50 1 .05 1.23 18 .50 1.17 .85 *.41 .47 .60 .65 .95 3.75 1.43 1 .00 1.17 19 .47 .80 *.80 .37 .41 .54 .60 .95 4.3 1.36 1 .05 1.10 20 .47 .75 .72 .40 .38 .54 .57 .90 1.69 1.30 11 .6 1.05 21 .77 .96 .66 1.00 .38 .50 .57 .85 1.17 1.30 49 1.00 22 .50 .80 .60 2.0 .34 .50 .54 .85 1.05 1.23 5 .6 .95 23 .50 .75 .55 4.2 .34 12.2 .54 .80 1.05 1.17 3 .05 1.04 24 .47 .75 *.50 3.5 1.21 5.2 1.04 .75 1.05 1.10 2 .3 .85 25 .86 1.49 .50 1.70 1.16 1.63 .47 .70 1.00 1.05 17 .2 .85 26 .50 .75 .47 .70 .38 19.2 .50 .65 1.00 1.00 10 .5 .80 27 4.0 .70 .44 .42 .38 3.2 1.23 .60 15.8 1.00 2 .5 .70 28 1.42 .70 .44 .40 .38 1.97 5.7 .60 4.0 .95 2 .65 .70 29 3.2 .65 .44 ,69 .38 24 3.0 2.65 .95 2 .7 .72 SO 1.05 1.45 .44 .38 .38 24 1.95 1.36 .90 2 .75 .76 31 .70 .65 .80 5-7 1.00 1.67 2 .15

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 4.0 0.44 0.901 1.39 27.9 86 Augi 7.4 .65 1.50 2.32 46.4 142 Sep 3.3 .44 1.00 1.55 30.0 92 Dot 4.3 .34 1.01 1.56 31.3 96 Hov 5.5 .34 .791 1.22 23.7 73 Dec 24 .26 3.66 5.66 113 348 C alendar year 192 43 .26 2.31 3.57 841 2,590 Jan 5.7 .47 1.29 2.00 40.0 123 Psb 12.2 .60 2.02 3.13 56.5 173 Mar 15.8 .54 2.32 3.59 71.8 220 App 34.5 .90 4.21 6.51 126 387 May 49 .85 5.08 7.86 158 484 Jun 13.8 .70 2.35 3.64 70. 4 216 PIscal year 1937- 38 49 .26 2.18 3.37 795 2,440

*Partly estimated. 52 ISLAND OF OAHU

Waiomao Stream above Pukele Stream, near Honolulu Location.- Concrete weir control, lat. 21°19'10", long. 157°46'45", 300 feet west of road, 1 mile upstream from confluence with Pukele Stream, and 5 miles east of Hono­ lulu post office. Zero of gage is 373.49 feet above mean sea level (Board of Water Supply bench mark). Drainage area.- 1.0 square mile. Records available.- June 1926 to June 1938. April 1911 to December 1912, at highway bridge downstream from present site. Average discharge.- 12 years (1936-38), 1.36 million gallons a day (2.10 second-feet). Extremes.- Maximum discharge during year, 208 million gallons a day (322 second-feet) June 11 (gage height, 4.49 feet), from rating curve extended above 45 million gallons a day by test on model of station site; minimum, 0.07 million gallons a day (0.11 second-foot) Dec. 11. 1911-12, 1926-38: Maximum discharge, 461 million gallons a day (713 second-feet) Apr. 11, 1930 (gage height, 6.27 feet), from rating curve extended above 10 million gallons a day by weir formulas; no flow in extremely dry weather. Remarks.- Records excellent except those for period of construction, May 11-22, (com- puted on basis of daily gage readings), which are fair, and those for periods when clock was not running, Dec. 24-27, Jan. 11-21, Feb. 16 to Mar. 27, Mar. 30 to Apr. 7, Apr. 9-28, Apr, 30 to May 9 (computed on basis of records for stations on all streams between the Pukele and the Kalihi), which are poor. Board of Water Supply diverts ground water from tunnels in drainage area.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a. day) 1.0 0.01 1.5 1.83 2.2 15.5 1.1 .10 1.6 2.7 2.4 24 1.2 .30 1.7 3.85 2.6 33.5 1.3 .63 1.8 5.3 2.8 44 1.4 1.15 2.0 9.4 3.0 55 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.10 0.73 0.33 0.10 5.1 0.18 2.1 1.43 0.17 0.70 0.23 1.56 2 .16 4.5 .28 .09 2.9 .16 1.29 1.81 .16 .50 .35 11.2 3 .18 3.1 .24 .09 1.27 .12 .89 12.4 .16 .40 .35 1.84 4 .89 1.10 .99 .14 .84 .42 .60 1.5E .16 .40 1.80 1.05 5 1.33 1.72 .40 48 .79 .56 .46 14.3 .16 1.60 1.20 .73 6 .59 .73 .40 .22 .73 .16 .37 2.0E 3.5 35 .65 .56 7 1.08 .71 2.3 .14 .63 .12 .63 1.1C 3.5 5.0 .30 .50 8 .76 .46 3.4 .62 .46 .12 1.74 .94 9.0 *1.68 .30 .46 9 .52 .40 .94 .26 .78 .12 .91 .89 2.0 24 16.0 1.09 10 .28 .75 .68 .14 .46 .09 .43 .79 1.40 24 *3.7 4.9 11 .22 .40 2.7 .10 .79 .08 .35 .89 .50 10.0 1.2 22 12 .20 .55 2.55 .08 .43 11.8 .30 .56 .37 5.0 4.0 3.65 13 .16 .59 .73 3.75 .28 1.58 .25 3.65 1.40 3.5 3.7 1.42 14 .14 .96 .50 3.15 .24 1.34 .21 1.22 1.20 2.2 2.0 1.35 15 .12 1.67 .37 1.42 .20 4.3 .18 *7.2 .50 1.5 .84 ,94 16 .18 3.5 .30 .56 .18 1.15 .16 1.3 .40 1.2 .53 .63 17 3.15 6.7 .28 .40 .16 .66 .15 .70 2.3 .90 .46 .53 18 .92 1.19 .22 .37 .14 .88 .14 ,50 4.0 .70 .46 .46 19 .40 .68 .28 .28 .12 .46 .13 .42 4.0 .55 .84 .43 20 ,33 .50 .24 .34 .10 .40 .1C .36 1.70 .45 10.0 .37 21 .76 1.09 .20 .80 .24 .33 .12 .32 1.00 .38 48 .28 S2 .46 .50 .16 1.43 .18 .28 *.12 .29 .70 .33 5.6 .26 23 .30 .40 .18 4.0 .10 17.9 .10 .26 .58 .29 1.92 .43 24 .24 .30 .16 3.85 1.18 5.0 .96 .24 .50 .25 1.35 .28 25 .85 1.33 .16 2.25 1.50 2.0 .24 .22 .44 .22 14.2 .28 26 .53 43 .37 .84 .50 19.0 .25 .20 .40 .20 8.4 .22 27 6.6 .30 .13 60 .56 3.5 .73 .19 15.0 .18 1.86 .20 28 2.45 .46 .25 .37 .33 2.2 4.8 .18 *4.2 .17 1.90 .18 29 3.5 ,42 .14 .30 .24 23 3.25 *3.0 *.16 2.0 *2£ 30 1.46 1.25 .12 .33 .18 26.5 2.7 1.80 ,18 1.87 .29 31 .89 .80 .52 5.3 1.35 1.20 1.15

Million gallons a day Seeond- Total run-off Month feet (mean) Million Acre-feet Maximum Minimum Mean gallons Jul 6.6 0.10 0.960 1.49 29.8 91 Aug Sit:::::::::::::::::::::::::: 6.7 .30 1.23 1.90 38.8 117 Sep 3.4 .12 .668 1.03 20.0 62 Oot 4.0 .08 .901 1.39 27.9 86 MOT 5.1 .10 .720 1.11 21.6 66 Dee 26.5 .08 4.18 6.47 130 398 C alendar year 193 63 .08 2.10 3.25 766 2,350 Jan 4.8 .10 .840 1.30 26.0 80 Fub 14.3 .18 2.00 3.09 56.0 172 Mar 16.0 .16 2.11 3.26 65. 4 201 Apr 35 .16 4.06 6.28 122 374 May 48 .23 4.42 6.84 137 421 Jun 22 .18 1.94 3.00 58.3 179 FIscal year 1937- 48 .08 2.01 3.11 732 2,850 *Partly estimated. ISLAND OF OAHU 53

Kahaluu Stream near Heela

Location.- Parshall flume, lat. 21 026'20", long. 157°51'05", 40 feet upstream from In- take of Libby ditch, half a mile upstream from forest-reserve boundary, and 3.5 miles northwest of Heela post office. Zero of gage Is 357.22 feet above mean sea level (Wrlght, Harvey & Wrlght Engineering Co. levels). Drainage area.- 0.4 square mile. Records available.- October 1935 to June 1938. Extremes.- Maximum discharge during year, 290 -million gallons a day (449 second-feet) Sept. 27 (gage height, 5.47 feet), from rating curve extended above 5 million gallons a day; minimum, 3.85 million gallons a day (5.96 second-feet) Apr. 2-5, 7, 8. 1935-38: Maximum discharge, that of Sept. 27, 1937; minimum, 2.35 million gallons a day (3.64 second-feet) Sept. 3-5, 1936. Remarks.- Records good except those for periods of missing gage heights, Jan. 3-9, my 18-20, which were computed on basis of records for station on Walhee Stream and are fair. No diversions above station. Continuous records of rainfall are obtained at the station.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day)

0.3 2.65 0.6 8.0 1.2 24 .4 4.2 .7 10.2 .5 6.0 .9 15.3

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.7 4.3 4.5 4.2 5.2 4.2 4.3 8.6 4.3 4.0 4.2 5.0 2 4.7 4.7 4.5 4.2 5.0 4.2 4.3 9.3 4.3 3.85 4.5 5.2 3 4.7 4.5 4.5 4.2 4.0 4.3 4. a 10.0 4.3 3.85 4.2 4.7 4 4.7 4.5 4.7 4.2 4.5 4.2 4.3 5.0 4.3 3.85 4.2 4.7 5 4.5 4.5 4.5 4.3 4.3 4.2 4.3 5.6 5.1 3.85 4.2 4.7 6 4.5 4.5 4.5 4.2 5.3 4.2 4.3 4.5 6.3 6.8 4.2 4.7 7 4.7 4.4 4.5 4.2 4.2 4.2 4.3 4.5 5.2 4.0 4.0 4.7 8 .2 4.2 4.3 4.5 4.3 3.85 4.0 4.5 9 4.5 4.4 4.5 4.2 .2 4.2 4.3 4.5 4.0 12.4 4.6 4.5 10 4.5 4.4 4.5 4.2 .2 4.2 4.3 4.5 4.0 11.9 4.2 5.0 11 4.5 4.4 4.7 4.2 .2 4.5 4.3 11.1 12 4.5 4.5 4.9 4.3 .2 13.1 4.3 5.0 4.0 4.3 4.2 4.9 13 4.4 4.5 4.5 4.5 .2 4.5 4.5 6.0 4.0 4.3 4.0 4.2 14 4.4 4.5 4.5 4.5 .2 4.5 4.5 4.5 4.0 4.3 5.8 4.2 15 4.3 4.5 4.4 4.3 .2 4.5 4.5 4.3 4.0 4.2 4.2 4.2 16 4.3 6.0 4.3 4.3 .2 4.5 4.5 4.3 4.0 4.2 4.0 4.2 17 9.4 5.7 4.3 4.4 .2 4.5 4.5 4.3 4.3 4.2 4.0 4.2 18 4.3 4.5 4.3 4.5 4.2 4.5 4.5 4.3 4.6 4.2 4.0 4.2 19 4.2 4.5 4.3 4.3 4.2 4.5 4.5 4.3 4.3 4.2 4.0 4.2 20 4.3 4.5 4.3 4.3 4.2 4.5 4.5 4.3 4.0 4.2 S.O 4.2 21 4.5 4.5 4.3 4.3 4.2 4.5 4.5 4.3 4.0 4.2 15.6 4.2 22 4.3 4.5 4.3 4.5 4.2 4.5 4.5 4.3 4.0 4.2 4.V 4.3 23 4.2 4.5 4.5 4.7 4.2 7.4 4.5 4.3 4.0 4.2 4.5 4.2 24 4.3 4.5 4.2 5. 1 4.3 4.7 4.5 4.5 4.0 4.2 4.3 4.7 25 4.5 4.5 4.3 4.5 5.7 4.8 4.5 4.5 4.0 4.2 5.V 4.3 26 4.5 4.5 9.5 4.0 4.2 4.5 4.5 4.3 4.0 4.3 5.0 4.3 27 4.9 4.5 12.1 4.0 4.2 4.2 4.5 4.3 10.0 4.2 4.5 4.3 28 4.5 4.5 9.3 4.0 4.2 4.S 7.1 4.3 6.6 4.2 4.5 4.3 29 4.4 4.5 4.3 4.0 4.2 7.2 4.5 4.9 4.2 4.5 4.5 SO 4.3 5.7 4.2 4.0 4.2 6.1 4,9 5.1 4.2 5.2 4.5 31 4 3 4.5 4.0 4.9 4.5 4.5 4.9

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 9.4 4.2 4.62 7.15 143 440 Augi 6.0 4.3 4.61 7.13 143 439 Sep 12.1 4.2 5.02 7.77 151 462 Oct 5.7 4.0 4.32 6.68 134 411 HOT 5.7 4.0 4.36 6. 75 131 401 Dee 13.1 4.2 4.95 7.66 153 470 C alendar year 192 22.5 3.35 4.63 V.16 1,690 5,180 Jan 7.1 4.3 4.52 6.99 140 430 Peb: 10.0 4.3 5.12 V-92 144 440 Mar 10.0 4.0 4.59 7.10 142 437 Apr 12.4 3.85 4.7S 7.40 143 440 May 15.6 4.0 4.90 7.58 152 466 Jun 11.1 4.2 4.70 7.27 141 432 P .seal year 1937- 15.6 3.85 4.7O 7.27 1,720 5,270 54 ISLAND OF OAHU

Waihee Stream near Heela

Location.- Parshall flume, lat. 21027'05", long. 157°51'35", 70 feet upstream from in- take of Kihe ditch, 120 feet downstream from forest-reserve boundary, and 4.1 miles northwest of Heela post office. Zero of gage Is about 193 feet above mean sea level. Drainage area.- 1.1 square miles. Records available.- December 1935 to June 1938. Extremes.- Maximum discharge during year, 279 million gallons a day (432 second-feet) Apr. 9 (gage height, 4.92 feet), from rating curve computed from 20 million to 230 million gallons a day by Parshall flume formula and extended above; minimum, 6.8 million gallons a day (10.5 second-feet) Oct. 4, 6, 7, 9-12. 1935-38: Maximum discharge, that of Apr. 9, 1938; minimum, 4.9 million gallons a day (7.6 second-feet) Jan. 24, 25, 1936. Remarks.- Records good except those for periods of missing gage heights, Feb. 1-3, May 9-20, which were computed on basis of records for stations on Kallhi and Kahaluu Streams and are fair. No diversions above station.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.5 0.9 17.5 1.4 35.5 1.0 1.6 44 11.6 1-1 24 14.5 1.2 27.5

Discharge, in million gallons, fiscal year July 1937 to Ju

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 8.6 8.6 7.9 7.2 10.2 7.7 9.1 18 7.7 8.6 7.7 9.6 2 8.6 9.4 7.7 7.2 9.8 7.7 8.4 EO 7.7 8.1 7.9 9.7 3 8.6 8.8 7.7 7.0 8.1 7.7 8.1 22 7.7 7.9 7.9 8.1 4 8.6 8.6 8.4 6.8 10.0 .7 7.9 9.4 7.9 7.9 7.9 S.I 5 8.6 8.6 7.7 7.0 8.8 .7 7.7 11.1 9.6 7.9 7.9 8.1 6 8.6 8.6 7.4 6.8 9.5 .7 7.7 8.4 11.6 15.6 8.1 7.9 7 9.6 8.6 7.7 6.8 8.1 .7 7.9 8.1 12.8 8.1 7.9 7.9 8 8.4 7.9 9.6 7.9 7.9 7.9 9 8.4 8.6 7.4 6.8 7.7 .7 7.9 7.9 8.6 27.5 9.5 8.4 10 8.4 8.6 7.7 6.8 7.7 7.7 7.9 8.1 8.4 28.5 8.0 9.4 11 3.4 8.6 8.8 6.8 7.9 9.8 .9 IE .3 8.4 9.4 8.0 14.5 12 8.4 8.8 8.4 6.8 7.9 E7 .9 8.4 8.6 8.4 8.2 9.1 13 8.4 8.8 7.9 7.2 7.9 8.4 .9 10.9 8.6 7.9 8.0 8.1 14 8.4 8.8 7.7 7.4 7.9 .9 .9 8.1 8.4 7.9 12 7.9 15 8.4 8.8 7.7 7.0 7.9 .9 .9 7.9 8.4 7.7 8.5 7.9 16 8.4 17.8 7.4 7.2 7.7 .7 7.7 8.4 7.4 8.0 7.9 17 26 9.6 7.4 7.4 7.7 .7 7. 13.5 7.4 8.0 7.9 18 9.1 8.1 7.4 7.4 7.4 .7 7. 11.7 7.4 8.0 7.9 19 8.4 7.9 7.4 7.4 7.4 .'? 7. 8.8 7.4 8.0 7.9 20 8.6 7.9 7.4 7.4 7-4 .7 7. 8.6 7.E 17 7.9 21 9.1 7.7 7.4 7.4 7.4 .7 7. 8.4 7.E 36.5 7.9 22 8.8 7.7 7.4 7.9 7.4 .7 7. 8.4 7.0 9.6 7.9 23 8.4 7.7 8.2 8.6 7.4 13. 7.7 7. 8.1 7.0 7.9 7.7 24 8.4 7.7 7.7 11.9 8.4 11. 7.7 7. 8.1 7.0 7.7 7.7 25 8.8 /.7 8.6 9.8 9.1 9. 7.7 7. 8.1 7.0 11.6 7.7 26 9.4 7.7 16.9 8.8 7.9 9. 7.7 7.7 8.1 7.4 9.6 7.9 27 10.3 7.7 20.5 8.6 7.9 9 . 8.1 7.7 23 7.E 7.9 7.9 28 9.6 7.9 17.0 8-4 7.9 14. 15.7 7.9 13.9 7.4 7.7 7.9 29 9.1 7.9 8.1 8.4 7.7 15. 8.4 10.7 7.4 8.1 7.9 SO 8.8 9.1 7.4 8.4 7.9 16.8 9.2 12.5 7.4 9.1 8.1 31 8.8 7.9 8.4 10.9 8.7 10.2 8.4

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 26 8.4 9.30 14.4 288 885 Augi 17.8 7.7 8.67 13.4 269 825 Sep 20.5 7.4 8.80 18.6 264 810 Oct 11.9 6.8 7.70 11.9 239 7S3 HOT 10.2 7.4 8.13 12.6 244 749 Dec 27 7.7 9.75 15.1 302 928 C alendar year 192 60 6.2 8.94 13.8 3,260 10,010 Jan 15.7 7.7 8.22 12.7 255 782 Feb 22 7.7 9.60 14.9 269 825 Mar 23 7.7 9.82 15.2 304 934 Apr 28.5 7.0 9.27 14.3 278 853 May 36.5 7.7 9.63 14.9 298 916 Jun 14.5 7.7 8.36 12.9 251 769 P Isoal year 1937- 36.5 6.8 8.94 13.8 3,260 10,010 ISLAND OF OAHU

MISCELLANEOUS DISCHARGE MEASUREMENTS

Measurements of streams and ditches on the island of Oahu at other than regular gaging stations are listed below:

Miscellaneous discharge measurements on Oahu during fiscal year July 193Y to June 1938^ Discilarge Date Stream Tributary to- Locality Second- Million feet gallons a day

Sept. 22 Pearl Harbor Pacific Ocean. . . . At 27-inch culvert 300 feet 4.92 3.18 Springs . west of Waiau railway station. 3 9V 2 5V V 19 5 64 5 49 of Walau railway station.

421

940 of Puukapu gaging station.

452 526

2 £8 of Puukapu gaging station.

4 46 2 91 at Kaluaoopu. 19 4 28 V 33 2 21 5 14 8 9 5V V 55 Co.'s railway bridge 15. -- Estimated. 56 ISLAND OF MDLOKAI

Halawa Stream near Halawa Location.- Concrete and masonry dam, lat. 21°09'30", long. 156 046'00n , about 500 feet downstream from confluence of two Bain branches, If miles west of Halawa, and 6 miles northeast of Pukoo. Drainage area.- 4.5 square miles. Records available.- August 1917 to July 1932, November 1937 to June 1938. Average discharge.- 14 years (1918-32), 18.1 million gallons a day (28.0 second-feet). Extremes. Maximum discharge during period, 1,470 million gallons a day (2,270 second- feet; Dec. 24 (gage height, 7.89 feet), from rating curve extended above 100 million gallons a day; minimum, 3.1 million gallons a day (4.8 second-feet) Dec. 9, 12. 1917-32, 1937-38: Maximum discharge recorded, 1.550 million gallons a day (2,400 second-feet) Mar, 31, 1923 (gage height, 11,65 feet), from rating curve extended above 150 million gallons a day; minimum discharge, 0.8 million gallons a day (1.2 second-feet) Oct. 13-15, 19, 1917. A greater discharge may have occurred Jan. 20, 1929. Remarks.- Records good except those above 150 million gallons a day, which are poor. A 1-Inch pip line diverts water about a quarter of a mile above station for domestic use of Halawa village.

Rating table, Hovember 1937 to June 193S (gage height, in. feet, and discharge, In million gallons a day) 1.8 2.2 2.7 35.5 4.5 350 2.0 6.1 3.0 66 5.0 470 2.2 9.3 3.5 145 2.4 16.0 4.0 245

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Kov. Dec. Jan. Feb. Mar. Apr. Hay June 1 4.6 21.5 15.2 8.4 7.B 9.0 45 2 4.5 14.8 63 7.2 8.2 10.4 32 3 4.1 11.5 73 66 8.8 20 14.0 4 4.B 9.8 14 239 6.2 63 10.9 5 5.2 8.8 68 65 6.0 13.2 9.3

6 3.8 7.5 14.2 64 295 9.1 S»2 7 3.4 42 10.6 16.6 180 9.0 7^9 8 3.2 55 12". 2 43 29 7.2 34 9 4.2 19.4 11.8 30.5 234 114 39.5 10 7.4 9.1 6.8 25 141 37 65 11 3.5 7.7 43 17.1 60 30.5 21.5 12 86 7.2 2S.5 10.4 48 71 20.5 13 9.0 7.9 52 18.0 23.5 23.5 10.6 14 47 6.4 16.4 44 29 17.5 15.5 15 48 5.5 9.6 19.0 16.0 43 13.6 16 11.3 4.6 8.2 20 IS. 8 10.6 8.8 17 *5.9 8.3 4.6 7.2 28 15.4 8.6 7.7 18 5.5 11.9 5.9 16.6 39 10.4 18.3 7.7 19 5.1 13.9 5.1 14.3 24 9.1 131 22 20 4.9 13.3 28 8.4 31 8.2 289 8.4 21 32.5 6.2 29 6.4 16.4 7.2 181 6.4 22 14.0 5.1 10.0 5.8 11.5 7.0 79 5.9 23 20 44 6.4 5.1 13.0 9.3 38.5 5.1 24 74 267 119 5.3 9.8 7.7 21.5 5.5 25 33.5 73 10.2 5.2 8.8 6.8 37 4.8 26 9.3 69 17.5 6.0 7.7 6.0 74 4.5 27 7.7 34 30.5 4.3 138 5.3 16.0 4.1 28 6.2 17.5 50 3.8 26.5 4.9 35.5 5.8 29 5.5 390 32 11.7 4.8 21 4.5 30 4.9 25B 68 9.8 4.6 39 5.3 31 41 18. S 8.2 30

Hlllion gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul AugiSsi:::::::::::::::::::::::::: Sep Oct NOT ember IV 74 4.9 16.4 25.4 229 703 Dec 390 3.2 48.4 74.9 1,600 4,600 C alendar year Jan 119 4.8 21.7 33.6 674 2,070 Feb 73 3.8 19.2 oh n 537 1,650 Mar 239 7.2 34.8 53.8 1,080 3,310 Apr 295 4.5 40.6 62.8 1,220 3,740 May 289 7.2 48.6 75.2 1,510 4,630 Jun 65 4.1 15.1 23.4 454 1,390 mle perlo 22,080 *Partly estimated. ISLAND OF MOLOKAI 57

-Walakeakua Stream near Wallau

Location.- Concrete boulder dam, lat. 21°07'30'1 , long. 156°49'40", three-quarters of a mile upstream from confluence with Pulena Stream, 3.2 miles south of Wallau, and 3.8 miles northwest of Pukoo. Zero of gage Is 698 feet above mean sea level, by Recla­ mation Service levels. Drainage area.- 1.4 square miles. Records available.- October 1919 to September 1929, September 1937 to June 1938. Extremes.- Maximum discharge during period, 263 million gallons a day (407 second-feet) Dec. 24 (gage height, 4.62 feet), from rating curve extended above 140 million gal­ lons a day; minimum, 3.2 million gallons a day (5.0 second-feet) Dec. 11, 12. 1919-29, 1937-38: Maximum discharge, 710 million gallons a day (1,100 second- feet) Mar. 31, 1923 (gage height, 7.15 feet), from rating curve extended above 140 million gallons a day; minimum, 1.3 million gallons a day (2.0 second-feet) Mar. 7, 1920. Remarks.- Records good. No diversions.

Rating table, September 1937 to Jtme 1938 (gage height, In feet, and discharge, In million gallons a day) 1.5 2.2 2.1 16.0 3.0 75 1.7 5.1 2.3 25 3.5 124 1.9 2.6 43

Discharge, In million gallons, fiscal year July 1937 to June 19S8

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June

1 3.9 4.4 17.9 4.4 10.7 8.9 3.9 5.1 4.6 13.3 2 9.8 6.0 17.1 4.1 8.6 10.9 3.7 4.9 5.3 11.9 3 7.6 4.4 6.4 3.9 7.7 17.6 7.0 4.8 7.7 7.4 4 7.7 7.1 5.7 3.9 6.6 7.4 SS 4.2 15.7 6.6 5 5.1 12.1 9.4 3.7 5.9 19.9 14.1 4.2 6.6 5.7 6 7.1 4.8 5.7 3.6 5.5 7.4 14.3 70 5.5 5.1 7 12.9 5.1 6.2 3.4 9.3 6.6 6.S S5 4.9 5.3 B 10.7 6.8 12.0 3.4 10.2 6.6 32.5 16.0 4.9 14.6 9 6.2 4.2 6.8 3.4 6.4 5.7 19.5 56 32 14.8 10 5.5 3.9 11.0 3.3 5.3 5.5 13.4 36 20 14. S 11 15.2 3.9 17.4 3.2 4.S IS. 2 8.2 24 13.1 11.0 12 13.4 3.7 7.2 16.1 4.6 11.5 6.8 20.5 16.9 9.1 13 6.8 15S4 5.9 10.2 4.8 9.3 9.8 11.6 9.1 6.8 14 5.7 14.9 5.3 14.1 4.4 6.8 15.1 10.4 7.9 8.4 15 6.S 5.7 4.8 15.5 4.2 5.7 8.4 8.4 6.6 7.0 16 5.7 6.2 4.4 6.8 4.1 5.5 9.6 7.7 5.7 5.7 17 4.8 4.9 4.2 6.3 4.2 5-3 12.9 6.8 5.3 5.3 IB 4.4 4.9 4.1 5.7 4.2 7.1 14.0 6.6 4.9 5.5 19 5.7 4.1 3.7 9.0 3.9 5.5 11.4 6.2 6.7 11. S 20 4.4 3.9 3,9 6.7 22.5 4.8 13.5 5.9 25 6.2 21 4.1 4.1 11.5 4.S 11.0 4.6 8.4 5.5 29.5 5.3 22 3.9 4.1 6.3 4.6 5.9 4.6 7.0 5.3 12.6 4.9 23 3.9 7.5 5.3 19.7 5.5 4.4 6.6 5.7 9.8 4.8 24 3.9 7.3 24.5 45 16.1 4.7 5.7 5.3 7.4 4.6 25 3.9 5.6 14.2 21 6.2 5.9 5.5 5.1 19.1 4.4 26 3.9 4.1 6.S 15.9 10.3 4.2 4.9 4.8 24.5 4.2 27 3.7 3.9 5.7 9.9 9.6 4.2 28.5 4.6 8.6 4.2 2B 3.4 3.9 4.9 7.7 14.7 3.9 9.8 4.4 9.2 4.2 29 3.4 3.7 4.6 78 15.2 6.6 4.4 11.1 3.9 30 3.6 3.4 4.6 66 9.9 5.9 4,4 14.5 3.9 31 5.5 17.4 7.9 5.3 10.5

Million gallons a day Second- Total run-off Month feet (mean) Million Mailman jUnlaum Mean gallons Acre -feet Jul Aug Li:::::::::::::::::::::::::: Sep 15.2 3.4 6.24 9.65 187 574 Oct 15.4 3.4 5.79 S.96 180 551 HOT 24.5 3.7 8.25 12. S 248 760 Dec 78 3.2 13.6 21.0 421 1,290 C alendar year

Jan 22.5 3.9 8.07 12.5 250 768 Pet 19.9 3.9 7.60 11.8 213 653 liar 32.5 3.7 11.2 17.3 347 1,070 Apr 85 4.2 14.8 22.9 444 1,360 32 4.6 11.8 18.3 365 1,120 Jufc 14.8 3.9 7.36 11.4 221 677 T ie perloi 8,820 58 ISLAND OF MOLOKAI

Pulena Stream near Wailau

Location.- Lat. 21°07'40", long. 156°49'50n , half a mile upstream from confluence with Walakeakua Stream, 3 miles south of Wailua, and 4 miles northwest of Pukoo. Zero of gage is 546 feet above mean sea level, by Reclamation Service levels. Drainage area.- 4.4 square miles. Records available.- October 1919 to December 1928, September 1937 to June 1938. Extremes.- Maximum discharge during period, 4,330 million gallons a day (6,700 second- feet) Dec. 24 (gage height, 7.91 feet), from rating curve extended above 220 million gallons a day; minimum, 4.6 million gallons a day (7.1 second-feet) Dec. 12. 1919-29, 1937-38: Maximum discharge recorded, that of Dec. 24, 1937; minimum, 3.0 million gallons a day (4.6 second-feet) June 28, July 14, 1920. Flood of Jan. 20, 1929, reached a stage of at least 22 feet (discharge not de­ termined) . Remarks.- Records good. No diversions.

Rating tables, September 1937 to June 1938 (gage height, In feet, and discharge, in million gallons a day) Sept. 1 to Dec. 12 Dec. 13 to June 30 0.9 3.5 9.3 2.0 66 1.1 7.0 13.2 2.5 138 1.3 13.2 1.1 IS.3 3.0 266 1.6 28.6 1.6 32.6 3.6 446 2.0 64 2.6 138

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. HOT. Dec. Jan. Feb. Mar. Apr. May June 1 8.9 7-8 50 8.9 33 21 16.1 17.8 11.9 35 2 17.1 11.8 61 6.6 26.5 2£ 12.8 19.8 16.7 33.5 3 13.2 14.5 20.5 6.4 21.5 50 25 18.8 21 ££ 4 12.6 16.4 23 7.8 19.3 21 32.6 14.9 26 18.0 5 9.7 21 34 6.0 17.5 59 21.5 14.4 14.6 15.6 6 14.1 10.4 18.6 5.4 16.4 23 19.6 283 11.7 13.9 V 20.6 8.9 25 6.2 25 19.6 14.9 444 10.6 16.6 8 17.1 11.8 42 60 97 18.9 80 68 10.6 26.6 9 10.8 8.6 23.5 10.1 £9 .5 17.0 46 375 30 30.5 10 9.4 8.1 35.5 6.0 20 18.8 31.6 156 36 30 11 20 8.4 31.5 4.7 17.6 40 24.5 94 28 22 12 20 8.1 20 97 16.1 28 22 77 31.6 17.8 13 11.4 £9 14.9 32 15.4 28 36 39.6 23.6 16.4 14 9.7 38 12.8 37 13.9 20 52 £9.6 21 24 15 10.0 16.4 11.1 38 13.0 17.5 34 26.5 17.2 21 16 9 .2 12.2 10.0 19.6 12.8 15.9 38 22.5 13.9 15.4 17 8.4 11.8 9.4 16.4 13.9 15.1 58 19.6 12.6 14.6 18 8.1 12.8 8.4 13.9 13.7 16.4 70 17.2 11.9 17.8 19 9.7 10.0 7.5 13.6 12.4 14.4 67 16.4 17.7 21.5 20 7.8 9.4 7.0 16.2 28 13.2 49 14.6 51 14.4 21 7.5 21 33.6 10.7 17.1 13.0 31 13.4 60 12.6 22 7.3 13.6 18.6 10.4 13.2 12.8 £5.6 13.2 36 11.7 23 7.8 20 16.2 4£ 12.8 12.6 24.5 14.6 27.6 1O.9 24 7.8 £1.5 69 319 47 21.6 20.6 12.8 19.9 10.6 25 8.4 15.4 60 105 16.1 25.5 19.3 12.8 32.6 10. 0 26 7.6 11.4 15.4 60 27.5 13.7 17.2 11.6 47 10.0 27 7.3 9.2 11.1 33 32 16.2 112 11.9 23 10.2 28 7.6 9.4 9.2 26.5 67 13.0 46 10.9 21 11.9 29 6.8 8.4 8.1 336 46 27 1O.2 23.6 9.7 30 7.0 8.1 7.8 218 28 22 10.4 29 9.7 31 11.8 52 22.6 19.3 28.6

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul Augi Sep 20.5 6.8 10.8 16.7 322 99O Oct 38 7.8 13.7 21.2 423 1,300 HOT 69 7.0 23.8 36.8 714 2,190 Dec 336 4.7 60.5 78.1 1,560 4,800 C alendar year Jan 97 12.4 26.2 39.0 781 2,40O Fet> 59 12.6 21.6 33.4 606 1,860 Mar 112 12.8 36.9 65.5 1,110 3,420 Apr 444 1O.2 63.0 97.6 1,890 6,8OO May 6O 10.6 24.7 38.2 766 2,360 Jun 36 9.7 17.7 27.4 532 1,630 Tlle perio 26,740 ISLAND OF MOLOKAI 59

Pelekunu Stream near Pelekunu

Location.- Lat. 21°08'20", long. 156°52'50", three-quarters of a mile upstream fron con- fluence with Lanipuni Stream, 1.8 miles south of Pelekunu, and 6.8 miles northwest of Pukoo. Zero of gage is 546 feet, by Reclamation Service levels. Drainage area.- 2.4 square miles. Records available.- December 1919 to January 1929, September 1937 to June 1938. Extremes.- Maximum discharge during period, 574 million gallons a day (888 second-feet) Apr. 9 (gage height, 3.74 feet), from rating table extended above 80 million gallons a day; minimum, 3.3 million gallons a day (5.1 second-feet) Oct. 12. 1919-29, 1937-38: Maximum discharge, 1,330 million gallons a day (2^060 second- feet) Jan. 20, 1929 (gage height, 11.5 feet, estimated, from floodmarks), from rat- Ing curve extended above 20 million gallons a day; minimum, 1.8 million gallons a day (2.8 second-feet) Mar. 7, July 13, 1920. Remarks.- Records excellent except those for period when clock was not running, Apr. 3- 14 (computed on basis of records for all stations on Mblokal), and those above 120 million gallons a day, which are fair. No diversions.

Rating table, September 1937 to June 1936 (gage height, In feet, and discharge, in million gallons a day) 0.9 3.4 1.6 23.5 1.1 6.0 2.0 57 1.3 10.6 2.5 133 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 3.5 19.3 6.9 22 11.6 11.7 11.6 7.2 27 2 4.0 23.5 5.4 15.5 10.3 8.5 12. S 15.3 29 3 5.4 10.1 5.4 12.6 31.5 20.5 13 15.3 16.0 4 6.6 10.3 7.3 11.6 12.6 21.5 10 15.6 11.9 5 8.3 15. S 5.0 10.1 31.5 13.2 10 7.S 10.1 6 4.3 9.6 4.5 8.8 14.3 10.9 200 6.4 S.5 7 3.8 14.2 4.3 15.9 11.9 9.0 240 5.7 8.3 8 4.8 28.5 4.4 22 10.6 43 40 5.7 10.6 9 3.7 15.5 12.7 19.9 9.6 40 120 22 11.4 10 3.5 19.4 5.2 12.6 17.6 31 86 23 13.6 11 3.5 16.2 4.3 10.3 30 21.5 70 IS.O 9.3 12 3.4 10.6 56 9.0 16.7 16.0 40 IS. 6 7.2 13 11.1 8.3 27 8.3 18.9 24.5 21 13.6 6.6 14 15.1 7.0 31 7.6 13.2 36 17 12.7 9.1 15 *5.2 6.5 6.2 27 7.2 10.9 29 15.5 10.6 9.2 16 5.0 4.8 5.7 15.1 6.8 9.6 30 13.2 8.5 6.S 17 4.5 4.3 5.2 11.9 8.3 9.3 46 11.6 7.4 6.4 18 4.4 5,7 5.0 9.8 7.4 9.3 48 10.1 6.6 7.9 19 5.0 4.0 4.5 8.8 6.6 8.3 45 9.0 8.5 8.2 20 4.3 3.8 4.5 8.6 6.4 7.6 35.5 S.3 56 6.2 21 4.1 13.6 24.5 7.0 6.2 7.2 24 7-6 79 5.7 22 4-0 7.3 12.9 7.2 6.0 7.0 17.6 7.2 40 5.1 23 4.3 12.8 9.6 24.5 6.6 6.6 16.4 8.4 26 5.0 24 4.1 IS.O 30.5 *54 26 16.7 12.9 6.8 17.2 4.6 85 4.0 12.4 32 35.5 8.5 20.5 11.9 6.8 18.0 4.5 26 3.8 7.4 13.6 35 16.3 8.8 10.3 6.0 28 4.5 87 3.8 5.9 9.8 20 22 11.0 38.5 6.7 15.1 4.6 88 3.7 5.4 7.8 14.7 44 8.9 51 6.0 13.2 5.7 29 3.5 4.6 6.8 *134 31.5 27 5.4 13.9 4.4 30 3.4 4.4 6.4 84 19.6 16.8 5.4 16.3 4.3 31 4.9 34 13.6 13.2 17.6

Million gallons a day Second- Total run-off Month feet (mean) Million Acre-feet Maximum Minimum Mean gallons Jul Augi 8ep bomber If 5.2 3.4 4.19 6.48 67.1 206 Oot sber 18.0 3.4 6-67 10.3 207 635 HOT 32 4.5 13.1 20.3 393 1,210 Dec 134 4.3 22.9 35.4 710 2,180 0 alendar year Jan 44 6.0 13.8 21.4 429 1,320 Feb BI.5 6.6 13.6 21.0 382 1,170 Mar 61 8.5 25.2 39.0 780 2,390 Apr 240 5.4 34.2 52.9 1,030 3,160 May 79 5.7 18.3 28.3 569 1,750 Jun 29 4.3 9.06 14.0 272 834

Tlis perio 14,840 Partly estimated. 60 ISLAND OF MOLOKAI

Lanipuni Stream near Pelekunu

Location.- Concrete and boulder control, lat. 21°08'40I! , long. 156°52'30", 0.4 mile up- stream from confluence with Pelekunu Stream, li miles southeast of Pelekunu, and 6.8 miles northwest of Pukoo. Zero of gage is 418 feet, by hand levels from Geological Survey benchmark. Drainage area-.- 0.8 square mile. Records available.- December 1919 to September 1929, September 1937 to June 1938. Extremes.- Maximum discharge recorded during period, 1,090 million gallons a day (1,690 second-feet) Apr. 9 (gage height, 4.74 feet), from rating curve extended above 30 million gallons a day; minimum recorded, 3.6 million gallons a day (5.6 second-feet) Feb. 28. 1919-29, 1937-38: Maximum discharge, 1,250 million gallons a day (1,930 second- feet) Dec. 24, 1920 (gage height, 5.90 feet); minimum, 1.8 million gallons a day (2.8 second-feet) Nov. 10, 11, 1926. Remarks.- Records good except those for periods of missing gage heights, Dec. 29, Jan. IT-IS, 22-24, 26, 27, Feb. 2, 3, 5, 10, 11, 13 (computed on basis of records for all other stations on Molokai), and those for discharges above 50 million gallons a day, which are fair. No diversions. Rating table, September 1937 to June 1938 (gage height, In feet, and discharge, In million gallons a day) 1.5 3.6 2.2 38 3.0 135 1.7 5.9 2.4 45 3.5 245 2.0 15.0 2.6 67 4.0 375 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.0 24.5 5 -.2 9.0 5.4 4.5 5.9 5.4 22.5 2 4.8 27 4.5 6.6 5.0 4.1 6.9 9.9 17.3 3 4.6 8.0 4.5 5.4 14 20.5 7.0 9.8 9.0 4 5.7 7.4 5 12.5 12.6 4.2 5.2 14 7.0 5.2 5.4 6.2 6 4.9 7.4 4,1 4.3 5.9 5.7 272 5.1 5.6 7 4.3 10.0 4.1 »10.7 5.4 4.9 323 4.8 6.2 8 5.1 19. 2 4.0 39 5.4 70 29 4.8 11.2 9 .2 10.7 5.2 11.1 4.9 27 179 41 14.0 10 .1 13.8 4.2 6.6 8.0 16.1 58 29 14.5 11 .1 13.5 4.0 S.7 14 9.7 46 19.8 8.0 12 .0 7.6 23 5.1 6.2 9.4 27 20 6.4 13 .7 6.2 20.5 4.9 7.0 16.9 10.4 10.2 5.6 14 16.8 5.4 36 4.6 5.4 20.5 7.8 8.2 9.3 15 9.3 5.1 23.5 4.5 4.9 14.S 6.6 7.6 8.3 16 *4.8 5.4 .8 9.0 4.5 4.6 19.5 6.2 5.7 6.0 17 4. .8 4.8 .6 6.4 5.4 5.2 42 5.7 5.1 5.9 18 4.8 4.3 .5 5.9 4.9 5.6 46 5.4 4.9 7.8 19 5.2 4.2 .3 5.2 4.5 4.6 35 5.1 13.1 9.2 20 4.5 4.1 .5 5.2 *4.1 4.3 19.9 4.9 88 6.0 21 4.3 4.1 32 4.6 *4.1 4.2 11.5 4.8 132 5.4 22 4.3 4.5 14.4 4.9 4.0 4.1 10.2 4.6 29.5 4.9 23 4.5 6.0 8.4 20.5 4.4 4.1 10.2 5.1 16.8 4.6 24 4.5 16.9 21.5 66 18 4.1 7.2 4.6 10.0 4.5 25 4.8 21.5 23 35 5.1 4.1 6.4 4.8 15.0 4.3 26 4.3 5.9 7.6 22.5 9.0 3.8 5.7 4.6 27.5 4.3 27 4.1 4.9 6.2 10.0 11 4.0 12.7 4.9 9.7 5.0 28 4.1 4.9 5.6 7.6 20 3.7 L0.5 4.6 6.4 5.9 29 4.0 4.5 5.1 220 10.2 8.4 4.3 13.5 4.3 30 4.0 4.2 5.1 156 7.8 6.6 4.5 14.8 4.3 31 6.2 18.8 «.o 5.9 12.8

Million gallons ft day Second- Total run-off Month feet Million IHnlnmm (mean) Acre -feet Maxlmm Mean gallons Jul Augi Sep ;ember 1 5.2 4.0 4.45 6.89 66.6 206 Oct ober 21.5 4.0 6.53 10.1 202 621 Mov 32 4.3 11.0 17.0 330 1,010 Dec 220 4.0 24.2 37.4 749 2,300 C alendar year Jan 39 4.0 8.12 12.6 252 773 Feta 14 3.7 5.98 9.25 167 SIS Mar 70 4.1 16.7 25.8 516 1,590 Apr 323 4.3 35.4 54.8 1,060 3,260 May 132 4.8 19.2 29.7 596 1,830 Jun 22.5 4.3 7.80 12.1 234 718 Hlie perio 12,820 Partly estimated. ISLAND OF MOLOKAI 61

Waikolu Stream below pipe-line crossing, near Kalaupapa

Location.- Sharp-crested weirs and concrete and stone dam, lat. 21°09'50", long. 156"56'00", three-quarters of a mile upstream from mouth and 3.9 miles southeast of Kalaupapa post office. Altitude, 253 feet, by Reclamation Service levels. Drainage area.- &.0 square miles. Records available.- August 1931 to July 1932, September 1937 to June 1938. June 1919 to November 1930 at site 500 feet upstream. Extremes.- Maximum discharge luring period, 2,510 million gallons a day (3,880 second- feet) Apr. 9 (gage height, 6.01 feet), from rating curve extended above 50 million gallons a day; minimum, 7.7 million gallons a day (11.9 second-feet) Oct. 20. 1919-32, 1937-38: Maximum discharge, that of Apr. 9, 1938; minimum, 1.3 million gallons a day (2.0 second-feet) Nov. 1-2, 1925, June 5, 1926. Remarks.- Records good except those above 75 million gallons a day, which are poor. Kalaupapa water-supply system diverts water above station.

Rating tables, September 1937 to June 1938 (gage height, In feet, and discharge, In million gallons

Sept. 20 to Dec. 12 13 to June 30 2.0 7.2 3.0 43 7.2 1.7 54 3.5 2.2 11.0 3.5 88 12.0 2.0 84 4.0 2.4 15.7 4.0 163 1.1 19.0 2.5 155 2.7 26 1.3 28 3.0 270

Discharge, In million gallons, fiscal year July 1937 to June

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. Hay June

1 8.6 17.0 8.3 13.3 10.6 17.2 9.6 12.7 30 2 8.5 29.5 8. 3 11.5 10.1 12.0 10.6 21 28.5 3 8.8 11.2 8.1 10.9 43 59 12.7 17.5 17.5 4 8.8 10.8 8.6 11.7 11.7 41 9.8 19.4 16.4 5 12.5 14.4 8.8 13.3 50 13.6 9.6 13.0 16.0 6 9.0 12.3 8.1 10.4 12.7 12.3 420 11.5 15.7 7 8.6 14.0 8.1 31 10.4 11.2 474 11.5 15.7 8 8.5 30 B.I 61 10.1 104 48 11.5 17.5 9 8.3 13.4 13.8 19.3 9.8 49 231 73 22.5 10 8.1 18.0 11.2 10.9 12.1 31 67 44 22.5 11 8.1 13.7 8.6 10.4 28 16.8 44 23.5 17.5 12 8.1 12.3 130 9.8 12.7 12.0 29 19.2 16.0 13 11.2 10.4 91 9.8 15.6 15.7 15.3 16.0 15.7 14 15.4 10.2 77 9.6 12.0 27.5 14.0 13.6 16.4 15 11.2 10.2 30.5 9.3 10.1 22.5 13.3 16.0 18.3 16 8.5 10.0 13.0 9.3 9.8 36.5 13.0 12.3 16.0 17 8.3 9.8 10.9 9.6 12.6 54 12.7 11.5 15.7 18 7.9 9.6 10.4 11.5 12.3 36 12.7 11.5 17.5 19 7.9 9.2 9.8 9.6 9.8 36 12.3 34.5 16.8 20 *9.0 7.9 9.2 9.6 9.6 9.6 22 12.3 181 16.0 21 9.0 22 46 9.3 9.3 9.3 13.3 12.0 179 21.5 22 8.8 14.8 20 9.6 9.1 9.1 12.3 11.7 34 16.0 23 8.8 21.5 11.2 36.5 9.6 9.1 12.7 11.7 29 15.0 24 8.6 23 16.2 47 102 13,1 11.5 11.7 21 14.6 25 8.6 16.0 21.5 17.2 13.0 31 10.9 11.7 21 14.6 26 8.6 10.0 10.2 28 17.0 12.0 10.4 11.7 39 14.3 27 8.6 8.8 9.0 13.0 24.5 12.0 16.4 12.3 19.9 14.3 28 8.6 8.8 8.8 10.9 54 12.0 30.5 12.0 17.9 14.6 29 8.6 8.3 8.6 275 21 13.6 11.7 19.4 14.6 30 8.6 8.1 8.5 189 15.7 10.4 11.5 22 14.3 31 8.5 21 12.3 9.8 21

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul AugUSt. ....------Sep tember 2 9.0 8.6 8.71 13.5 95.8 294 Oct Ob6Z* 23 7.9 10.8 16.7 334 1,030 HOT 46 8.5 14.5 22.4 435 1,340 Dec 275 8.1 36.7 56.8 1,140 3,490 Calendar year Jan 102 9.1 18.7 28.9 579 1,780 Fob 50 9.1 15.0 23.2 421 1,290 Hap 104 9.8 25.2 39.0 781 2,400 App 474 9.6 53.0 82.0 1,590 4,880 May 181 11.5 32.2 49.8 997 3,060 Jun 30 14.3 17.4 26.9 522 1,600 35he perlo 21,160 Partly estimated. 220672 0 40 5 62 ISLAND OF MOLOKAI

MISCELLANEOUS DISCHARGE MEASUREMENTS

Measurements of streams on the Island of Molokai at other than regular gaging stations are listed below:

Miscellaneous discharge measurements on Molokai during fiscal year July 1937 to June 1938 Dis Jharge Million Date Stream Tributary to- Locality Second- feet gallons a day Aug. 19 Walakeakua. .... Pacific Ocean. . . . At gaging station near Wallau... 12.1 7.82 19 .. ..do...... do...... Weir 10, near Wailau...... 4.11 2.66 19 near Wailau. Kalaupapa. ISLAND OF MAUI 63

Honokohau Stream near Honokohau

Location.- Lat. 20°57'45", long. 156°35'20", 1,000 feet upstream from intake of JionoKonau ditch and about 5 miles southeast of Honokohau. Altitude, about 950 feet, by barometer. Drainage area.- 4.2 square miles. Records available.- March 1913 to September 1920, May 1922 to June 1938. Average dIscharge.- 20 years (1916-20, 1922-38), 26.2 million gallons a day (40.5 second- feet). Extremes.- Maximum discharge during year, 1,160 million gallons a day (1,790 second-feet) Apr. 7 (gage height, 6.35 feet), from rating curve extended above 120 million gallons a day; minimum, 12.8 million gallons a day (19.8 second-feet) Dec. 21. 1913-20, 1922-38: Maximum discharge, 2,200 million gallons a day (3,400 second- feet) Feb. 13, 1924 (gage height, 7.92 feet), from rating curve extended above 100 million gallons a day; minimum, 6.2 million gallons a day (9.6 second-feet) June 30, 1926. Remarks.- Records excellent except those for period of missing gage heights, Nov. 21-26, wnicn were computed on basis of records for Honokawal ditch near Lahaina and are fair, and those above 200 million gallons a day, which are poor. No diversions. Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 2.1 12.4 2.6 3.4 130 4.5 398 2.2 16.0 2.8 3.5 204 5.0 570 2.4 25 3.0 4.2 304 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 23.5 173 19.2 17.6 55 14.9 18.8 18.4 19.6 16.0 28.5 45 2 31.5 263- 37 30 76 14.9 17.6 17.2 17.2 21 49 122 3 39 104 40 42 17.6 14.9 19.2 92 32 27 66 30 4 38.5 28 48 49 15.6 14.6 16.4 18.8 113 16.8 89 24.5 5 31 29 22.5 44 22 14.6 18.8 28.5 24 16.0 33.5 24 6 50 29 27.5 17.6 16.4 14.2 16.0 18.0 18.4 239 25.5 23.5 7 42 25 69 34 21.5 13.8 31 17.2 16.8 505 22.5 25.5 8 20 27.5 33 39.5 51 13.8 33 27 154 92 22 50 9 17,6 42 22 17.2 31 14.9 28.5 24 64 326 167 140 10 16.8 78 19.6 16.8 30 15.6 16.0 17.6 57 290 164 140 11 21 36.5 83 17.2 66 14.2 16.0 25.5 25 92 70 35 12 21 41 44 18.6 32.5 58 15.6 18.8 40 154 118 31 13 17.2 55 19.6 75 15.6 28.5 15.3 35.5 74 37 30.5 27 14 18.0 38.5 19.2 34 14.6 114 15.3 21 60 39 25 72 15 32 177 26 20 14.2 78 14.9 J.7.6 39 27.5 28.5 40 16 19.7 67 24 39 14.2 26.5 14.9 17.2 50 58 23 36.5 17 89 44 18.4 18.4 13.8 15.3 47 19.0 153 28 21.5 26 18 25 22 18.0 40 13.8 14.2 21 33 218 23.5 22 35 19 17.6 19.2 23.5 16.4 13.8 13.5 15.6 18.4 98 23 33.5 34.5 20 61 20.5 18.8 15.6 13.8 13.5 15.3 17.2 41 23.5 130 25 21 96 19.2 18.0 15.3 45 12.8 14.6 16.4 26 22 141 24.5 22 30.5 18.0 18.0 15.3 65 13.1 14.6 16.0 38 22 43 25.5 23 19.2 20.5 24.5 15.6 80 79 13.8 16.0 39.5 35.5 54 23.5 24 26.5 19.6 18.8 27.5 60 49 63 16.0 21.5 23 43 23.5 35 78 29.5 18.0 28.5 35 15.6 26 17.2 21 30 59 23.5 26 29 28 19.2 16.8 18 19.2 201 18.4 18.0 24 133 23 27 31 29 17.6 16.0 16.0 16.4 136 18.0 17.6 39 28 26.5 28 18.4 28.5 18.4 16.4 15.6 27 49 16.8 17.2 30 48 33.5 29 63 S9.5, 18,8 16.4 19.5 167 22.5 16.8 22 139 24 30 20 SB 18.4 28 15.6 254 78 16.4 21.5 68 24 31 89 20 23.5 44 24.5 16.4 47

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-f«et Jul 96 16.8 36.5 56.5 1,130 3,470 Aug- 263 18.0 51.2 79.2 1,590 4,870 Sap 83 17.6 27.4 42.4 822 2,520 Oet 75 15.3 26.5 41.0 821 2,520 HOT 80 13.8 30.6 47.3 «918 2,820 Dae 254 12.8 39.3 60.3 1,220 3,740 0 alendar year 193 263 12.8 40.1 62.0 14,610 44,850 Jan 201 13.8 33.8 52 3 1,050 3,220 Fab 92 16.0 22.7 35.1 637 1,950 Mar 218 16.4 50.4 78.0 1,560 4,790 Apr 505 16.0 77.4 120 2,320 7,130 May 167 21.5 63.6 98.4 1,970 6,050 Jun 140 23 41.3 63.9 1,240 3,800 PIseal year 1937- 505 12.8 41.9 64.8 15,880 46,880 64 ISLAND OF MAUI

Honokawai ditch near Lahaina

Location.- Lat. 20°56'00", long. 156°37'30", Just downstream from intake on Honokawai Stream, 24 miles upstream from Pioneer Mill Co.'s power house, and 74 miles northeast of Lahaina. Altitude, about 1,900 feet, from topographic map. Records available.- July 1912 to June 1938. Average discharge.- 19 years (1919-38), 5.89 million gallons a day (9.11 second-feet). Extremes.- Maximum daily discharge, 26 million gallons a day Aug. 1; minimum, 2.95 mil- lion gallons a day Aug. 6. 1912-32: Maximum discharge, 76 million gallons a day (118 second-feet) Aug. 11, 1929 (gage height, 2.17 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records of daily discharge since July 1932 furnished by Pioneer Mill Co. Ditch diverts water for power and irrigation from Honokawai Stream Just above station. Flow regulated by head gates at intake.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 5.0 26 3.6 3.15 15.2 3.75 4.0 3.7 4.1 3.25 5.1 11.2 2 6.3 19.5 8.0 4.1 13.4 3.75 3.8 3.5 3.45 3.7 12.8 19.4 3 7.3 12. e 7.7 9.5 3.85 3.7 3.8 5.4 4.1 6.1 16.9 4.9 4 6.6 6.1 7.8 B.O 3.6 3.75 3.7 3.4 12.2 3.55 14.1 3.8 5 5.3 5.0 3.65 11.2 4.B 3.7 3.9 3.9E 4.1 3.4 5.0 3.65 6 12.3 2.95 5.2 4.0 4.2 3.75 3.65 3.4 3.5 18.0 3.2 3.45 V 10.4 4.6 11.0 3.3 5.2 3.8 7.B 3.2E 3.35 9.4 3.2 4.0 8 4.6 6.0 B.I 7.0 11.7 3.8 6.6 3.2E 12.1 6.5 3.15 9.4 9 4.1 11.0 4.0 3.45 10.5 4.0 6.0 3.6E B.O 22 9.4 22.5 10 3.9 13.2 3.5 3.25 5.4 4.2 3.75 3.3 9.0 13.6 14.8 16.9 11 4.7 8.0 10.9 3.3 13.3 3.8 3.55 3.2£ 4.1 7.4 12.6 4.4 12 5.2 8.9 8.4 3.3 4.6 10.7 3. 3.3E 8.1 9.6 15.7 3.9 13 4.4 8.5 3.35 15.7 3.85 5.8 3. 6.0 15.7 4.5 4.8 3.9 14 4.4 11.3 3.4 8.6 3.65 16.8 3. 3.7 13.3 3.85 3.55 16.1 15 B.3 18.7 3.45 5.0 3.65 10.3 3. 3.3 7.4 3.7 4.2 8.5 16 5.1 9.9 3.95 7.4 3.65 5.6 3. 3.2 12.8 2.95 3.6 6.1 17 15.9 .5 3.25 4.1 3.7 3.85 9. 3.15 24 3.9 3.3 4.1 18 5.9 .3 3.15 12.9 3.8 3.75 4. 4.0 23 3.75 3.25 6.1 19 4.3 .2 3.45 4.9 3.8 3.7 3. 3.4 18.5 3.65 3.35 5.1 20 13.5 .3 3.55 3.5 3.7 3.65 3. 3.25 7.7 3.65 16.1 3.95 21 19.5 .3 3.25 3.55 B.5 3.65 3. 3.2 5.3 3.55 17.4 3.7 22 9.2 .0 3.15 3.55 12.1 3.65 3. 5 3.15 12.0 3.4 6.2 3.6 23 5.0 .1 4.1 3.55 14.7 11.4 3. 3.15 9.5 6.4 6.4 3.55 24 6.8 .0 3.45 3.7 12.8 6.9 8. 3.15 4.2 3.3 5.5 3.55 25 11.7 .6 3.15 4.6 11.7 3.85 3. 3.15 4.0 4.7 8.1 3.6 26 4.9 3.15 3.85 4.8 5.3 9.5 3.7 3.5 3.7 19.0 3.65 ev 4.8 .2 3.1 3.8 4.0 4.2 7.2 3.5 3.5 7.2 4.1 4.1 28 4.2 .7 3.1 3.7 3.9 4.0 7.5 3.4 3.55 5.0 5.5 6.2 29 10.8 .2 3.1 3.7 4.6 14.2 4.5 3.4 3.4 20.5 3.95 30 6.1 .7 3.1 5.7 3.9 12.9 4.7 3.25 3.25 13.6 3.85 31 17.0 .8 5.6 6.8 3.85 3.25 9.2

Million gallons a day Second- Total run-off Month feet Hft ttl'qimn (mean) Million Mailman Mean gallons Acre-feet Jul 19.5 3.9 7.66 11.9 238 729 Augi J;i:::::::::::::::::::::::::: 26 2.95 7.9V 12.3 S47 758 Sep 11.0 3.1 4.74 7.33 142 436 Oct 15.7 3.15 5.51 8.53 171 525 HOT IS. 2 3.6 6.88 10.6 207 634 Dec 16.8 3.65 5.90 9.13 183 562 C alendar year 193 V ...... 26 2.55 6.19 9.58 2,260 6,930 Jani 9.7 3.2 4.78 7.40 148 454 Fob 6.0 3.15 3.56 5.51 99.8 306 Mar 24 3.25 8.19 12.7 254 779 Apr 22 2.95 6.01 9.30 180 553 May 20.5 3.15 8.83 13.7 274 840 Jun 22.5 3.45 6.VO 10.4 201 617 P Lscal year 1937- 26 2.95 6.42 9.93 2,340 7,190 ISLAND OF MAUI 65

Olowalu ditch near Olowalu

Location.- Lat. 20°49'40", long. 156°36'40", 114 feet upstream from intake of pipe line to hydroelectric plant, li miles northeast of Olowalu, and 7 miles east of Lahaina. Records available.- August 1911 to June 1938. Average discharge.- 20 years (1917-20, 1921-38), million gallons a day (7.55 second- feet)." Extremes.- Maximum daily discharge, 11.4 million gallons a day May 10; minimum, 3.65 mil- lion gallons a day Jan. 23. 1911-32: Maximum discharge, 18 million gallons a day (28 second-feet) Dec. 25, 1920 (gage height, 1.53 feet, former site and datum); no flow occasionally, when water was shut out of ditch. Remarks.- Record of daily discharge since January 1932 furnished by Pioneer Mill Co. intake in Olowalu Stream at altitude of about 450 feet. Water used for power and irrigation. Regulated by head gates.

Discharge, In million gallons, fiscal year July 1937 to June 1933

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.5 9.0 6.5 4.3 7.1 4.6 8.0 8.E 6.3 6.5 7.8 10.1 2 4.7 9.0 8.0 5.0 7.7 4.3 8.0 9.0 5.6 6.6 8.9 10.5 3 7.8 9.1 7,7 5*9 5.9 4.2 7.5 10.1 5.7 6.4 9.2 10.4 4 7.5 9.1 9.0 5.B 5.1 4.2 6.7 9.0 8.9 6.0 10.4 10.2 5 7.8 9.2 8.2 7.3 5.0 4.1 6.6 8.8 9.6 5.6 9.4 10.0 6 7.2 9.3 7.8 5.0 4.4 3.95 5.7 7.0 8.6 8.4 8.5 9.3 7 8.0 9.4 8.5 5.0 4.7 3.85 6,4 6.9 7.3 10.8 7.8 9.0 e 6.4 9.2 9.2 3.95 6.8 4.0 6.0 4.2 9.4 9.9 7.2 9.7 9 5.4 9.2 8.6 4.6 6.2 5.0 7.6 4.0 10.5 10.0 8.3 10.6 10 5.0 9.3 7.4 4.5 6.2 4.6 6.6 4.1 10.2 10.7 11.4 10.6 11 4.7 9.3 8.6 4.3 7.2 3.9 5.8 4.4 9.9 9.3 10.9 10.3 12 4.6 9.4 9.1 4.2 7.6 6.1 5.5 5.9 9.6 9.3 11.0 10.1 13 4.4 9.3 8.3 6.9 6.S 7.7 5.1 8.0 9.9 8.6 10.8 9.5 14 4.4 9.1 9.9 8.2 10.5 10.4 15 4.7 9.3 7.2 4.8 4.9 7.8 4.7 7.6 10.0 8.0 10.4 10.3 16 4.5 9.4 7.0 4.5 4.5 7.9 4.5 6.8 10.2 9.1 10.2 10.2 17 5.9 9.5 6.3 4.5 4.3 7.7 5.8 6.4 10.6 9.9 10.1 10.0 16 5.6 9.4 5.8 4.1 6.8 5.1 6.4 11.0 9.8 9.6 9.8 19 4.8 9.4 6.2 7.'l 4.0 5.9 4.5 5.9 B.6 9.7 9.2 9.4 20 7.2 9.4 5.5 6.6 3.85 5.2 4.4 5.4 7.2 9.7 10.3 8.3 21 8.2 9.4 5.3 8.0 4.4 5.0 4.3 5.1 8.0 9.8 10.7 7.7 22 8.7 9.1 5.2 6.7 6.0 4.8 4.0 4.9 8.0 9.7 10.4 7.3 23 6.8 8.8 5.2 6.5 7.8 7.1 3.65 4.8 8.2 9.8 10.3 6.8 24 6.6 8.2 4.8 6.6 7.7 7.4 4.9 4.8 8.1 9.5 10.3 6.6 25 7.5 8.6 4.8 6.8 8.0 6.5 4.4 8.3 8.0 9.5 10.3 6.3 26 8.4 8.8 4.6 5.6 8.0 5.7 6.4 6.8 7.9 9.0 11.0 5.8 27 8.6 8.7 4.5 5.1 7.1 5.2 7.0 6.6 7.9 10.0 10.4 6.5 28 8.6 8.5 4.4 4.9 5.9 5.2 7.1 6.2 7.7 9.5 10.3 6.2 29 8.8 8.0 4.4 4.7 5.6 7.4 7.0 7.1 8.7 10.7 5.7 30 8.4 7.8 4.3 5.0 4.8 7.9 7.0 6.7 8.5 10.9 5.6 31 8.5 7.2 4.8 8.0 7.0 6.4 10.5

Million gallons a day Second- Total run-off Month feet (mean) Million Acre-feet Maximum Minimum Mean gallons Jill 8.8 4.4 6.59 10.2 204 627 Augi 9.5 7.2 8.99 13.9 279 855 Sep 9.2 4.3 6.66 10.3 200 613 Oot 8.2 3.95 S.57 8.62 173 530 Hov 8.0 3.85 S.88 9.10 177 542 Dec 8.0 3.85 5.79 8.96 179 551 C alendar year 192 10.2 3.85 7.38 ii.4 2,690 8,260 Jan 8.0 3.65 5.88 9.10 182 559 Feto 10.1 4.0 6.61 10.2 185 568 Mar 11.0 S.6 8.48 13.1 263 807 Apr 10.8 5.8 8.89 13.8 267 818 May 11.4 7.2 9.93 15.4 308 944 Jun 10.6 5.6 8.77 13.6 263 808 Plocal year 1957- 11.4 3.65 7.34 11.4 2,680 8,220 66 ISLAND OF MAUI

Oheo Stream below diversion dam, near Kipahulu

Location.- Concrete control, lat. 20°41'05", long. 156°04'10", Just downstream from old diversion dam at elevation 1,550 feet, 2 miles northwest of Kipahulu and 2i miles up­ stream from mouth. Drainage area.- 5.8 square miles. Records available-.- February 1927 to September 1929, December 1931 to June 1938. Extremes .- Maximum discharge recorded during year, 2,920 million gallons a day (4,520 secona-feet) Jan. 20 (gage height, 12.40 feet), from rating curve extended above 400 million gallons a day; no flow Nov. 21, 22, Jan. 16, 17. 1927-29, 1931-38: Maximum discharge, 6,190 million gallons a day (9,580 second- feet) Jan. 4, 1933 (gage height, 11.95 feet), from rating curve extended above 400 million gallons a day; no flow in dry periods. Remarks.- Records good. Discharge for Dec. 11-22 and Feb. 12 to May 19 not computed because of Insufficient data. Small quantity of water is diverted for domestic supply and livestock.

Rating tables, fiscal year 1937-3S (gage height, In feet, and di a charge, In million gallons a day) July 1 to May 18 May' 19 to June 30 1.1 0 2.0 10.7 5.0 285 0.06 2.6 31. 1.2 .02 29.5 6.0 470 .76 3.0 58 1.4 .49 58 7.0 705 2.85 3.5 98 1.6 2.05 3.5 98 8.6 4.0 149 1.8 5.3 4.0 149 18.0 5.0 285 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. HOT. Dec. Jan. Feb. Bar. Apr. Bay June

1 43 623 0.12 48 28.5 19.2 4.2 19.8 204 2 21 509 5.4 56 11.3 2.15 1.44 75 237 3 28 189 2.7 26 .69 .44 .76 61 16.4 4 56 33.5 15.8 36 31 13.2 .49 17.3 50 5 69 24 8.8 30 83 1.56 .36 42 1.95 6 245 9.1 11 3.1 19.4 .54 .26 17.3 .90 7 63 9.5 20.5 10.6 57 .29 1.36 17.3 16.7 6 62 10.0 19.1 23 142 .21 1.04 17.4 29 9 16.8 33.5 1.20 1.16 66 .21 10.8 18.1 140 10 4.5 50 .33 .36 29.5 .49 .21 46 94 11 21 17.2 20.5 .26 87 .08 488 26.5 12 19.8 32.5 24 .15 8.4 .12. 18.2 13 4.7 13.8 2.0 13.3 1.59 .15 5.9 14 11.8 27.5 .40 45 .59 .03 29.5 15 12.1 151 66 13.8 .36 .01 17.0 1.6 9.5 187 6.0 18.3 .24 0 17.0 17 64 31.5 .84 69 .13 23 7.4 16 13.2 6.2 .40 42 .07 12.8 10.0 19 2.2 2.4 .26 29.5 .02 57 3.65 20 9.8 2.25 .18 2.4 .01 410 160 .76 21 200 5.4 .14 9.1 .01 192 88 .30 22 155 .96 1.22 3.15 5.6 19.6 6.6 .44 23 39 6V8 92 1.19 76 108 5.8 1.30 .18 24 21 1.99 13.5 18.5 524 164 17.0 .34 1.65 25 55 9.2 55 6.9 218 132 8.0 16.9 .20 26 34.5 6.7 12.2 .49 10.5 398 346 42 .14 27 184 9.8 47 .29 2.35 165 504 2.7 13.2 26 16.2 9.5 8.9 .21 .96 46 544 70 27.5 29 80 1.3 1.32 1.35 2.95 56 31.5 48 .61 30 29.5 .24 .44 7.7 27 225 124 52 9.9 31 237 .12 1.95 19.8 23 65

Billion gallons a day Second- Total run-off Month feet UTi^nnmi (mean) Hllllon Hazlnnm Bean gallons Aore-feet Jul 245 2.2 59.0 91.3 1,830 5,610 Augi 623 .12 65.0 101 2,010 6,180 3ep 92 .12 14.6 22.6 437 1,340 Oet 69 .15 16.7 25.8 519 1,590 Nor 524 .01 47.8 74.0 1,430 4,400 Dee C alendar year

Jan 544 0 75.5 117 2,340 7,180 Peb Bar Apr H«y Jun 237 .14 31.2 48.3 935 2,670 P .seal year ISLAND OF MAUI 67

Makaplpi Stream near Nahiku

LocatIon.- Concrete control, lat. 20°48'35", long. 156°05'55", 100 feet upstream from highway crossing, H miles south of Nahiku, and 4f miles southeast of Keanae post office. Drainage area.- 5.0 square miles. Records available.- July 1932 to June 1938. Records at same site obtained by East Maul irrigation Co. June 1930 to June 1932. Extremes.- Maximum discharge during year, 1,220 million gallons a day (1,890 second-feet) Apr. 7 (gage height, 5.90 feet), from rating curve extended above 70 million gallons a day by tests on model of station site; minimum, 1.6 million gallons a day (2.5 second- feet) Dec. 13, 14. 1932-38: Maximum discharge, that of Apr. 7, 1938; no flow occasionally during dry weather. Remarks.- Records good except those for periods of missing gage heights, Jan. 31 to Feb. 3, 12-14, Apr. 27 to May 23, May 28 to June 6, 19-20 (computed on basis of records for stations on nearby streams), and those above 300 million gallons a day, which are poor. Koolau ditch diverts water 1 mile above station for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.2 0.5 6.7 1.0 2.0 166 590 .3 .6 10.7 1.2 2.5 250 900 .4 22.5 1.5 3.0 350

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 3.6 70 6.4 6.1 3.6 2.8 21.5 10 2.8 2.6 8.0 14 2 3.6 70 7. 5.0 3.4 2.4 13.1 7.0 2.8 2.6 30 18 3 3.6 50 6. 4.7 3.4 2.2 9.5 6.0 3.0 2.6 20 7.0 4 3.6 22.5 6. 5.2 3.2 2.2 6.7 4.7 7.1 2.6 13 6.6 5 3.6 15.7 6. 5.2 3.2 2.0 5.0 4.7 5.0 2.6 11 6.4 6 27.5 11.7 6. 5.0 3.0 1.8 4.1 4.1 4.4 148 9.0 6.2 7 8.3 8.7 6. 5.2 3.0 1.7 4.4 3.8 3.6 791 8.5 6.1 8 6.7 6.7 7. 5.2 4.0 1.7 3.6 3.6 24.5 492 9.0 6.1 9 6.4 6.1 6. 5.0 3.2 1.7 3.4 20.5 228 35 44 10 6.1 11.6 6. 4.7 3.0 1.7 3.6 3.2 5.2 233 60 20 11 5.5 16.6 7. 4.4 5.8 1.7 3.4 5.0 4.4 89 35 8.7 12 5.0 9.9 6. 4.1 4.4 1.6 3.2 25 4.1 93 45 7.5 13 4.7 8.3 6.7 4.4 3 8 1.6 3.0 10 4.7 50 15 6.7 14 4.4 8.3 6.4 4.1 3'.6 3.2 2.8 5.5 5.2 72 10 6.7 15 4.1 , 48 8.5 3.8 3.2 2.4 2.6 4.7 5.0 52 8.0 6.7 16 3.8 34.5 6.7 3'. 8 3.0 2.2 2.6 4.4 9.0 31 7.5 6.7 17 4.7 18.6 6.4 3.6 2.8 2.2 2.6 4.1 35.5 20.5 7.0 6.4 18 5.0 18.4 6.1 4.1 2.6 2.2 2.8 3.8 60 13.9 7.0 6.1 19 4.7 12.7 6.1 3.6 2.2 2.2 2.8 3.8 50 .5 35 8.0 20 4.4 10.7 5.8 3.4 2.2 2.2 20 3.8 23 .1 50 6.2 21 13.9 9.1 5.5 3.2 4.9 2.0 6.2 3.6 17.6 .1 100 5.8 22 9.9 8.3 5.5 3.2 4.9 2.0 3.8 3.6 13.2 .1 13 5.8 23 7.5 7.9 5.8 3.0 9.7 15.5 3.4 3.6 13.7 .5 12 5.5 24 7.9 7.5 5.2 5.2 26.5 15.5 14.5 3.4 9.5 .9 *16.5 5.2 85 8.7 7.1 5.0 5.8 37 28 3.6 3.4 6.7 8.3 14.5 5.0 26 8.3 7.1 5.0 4.1 12.2 46 52 3.2 5.5 8.3 57 5.0 27 7.9 6.7 5.0 3.8 7.5 20 80 3.2 4.7 10 33 4.4 28 6.4 7.1 4.4 3.4 5.0 17.8 141 3.0 3.8 8.0 20 4.4 29 6.4 6.7 4.7 3.4 4.1 125 40 3.2 8.0 21 4.4 30 6.1 7.1 4.7 3.2 3.4 147 20.5 3.0 8.0 30 4.4 31 37.5 6.7 3.4 37 14 2.8 10

Million gallons a day Second- Total run-off Month feet (mean) Million Acre-feet Maximum Minimum Mean gallons Jul 37.5 3.6 7.74 12.0 240 736 Aug> 70 6.1 17.4 26.9 540 1,660 Sep 8.5 4.4 6.19 9.58 186 570 Oot 6.1 3.0 4.27 6.61 132 406 HOT 37 2.2 6.06 9.38 182 558 Dec 147 1.6 16.0 24.8 498 1,530 C alendar year 193 155 1.6 14.4 22.3 5,270 16,170 Jan 141 2.6 16.7 25.8 518 1,590 Feb 25 3.0 5.27 8.15 148 453 Mar 60 2.8 11.7 18.1 364 1,120 Apr 791 2.6 80.7 125 2,420 7,430 May 100 7.0 84.2 37.4 750 2,300 Jun 44 4.4 8.47 13.1 254 779 F Iseal year 1937-38 ...... 791 1.6 17.1 26.5 6,230 19,130

Partly estimated. 68 ISLAND OF MAUI

West Makapipl Spring near Nahlku

Location.- Parshall flume, lat. 20°48'20", long. 156°06'20", half a mile upstream from highway, 1.7 miles south of Nahlku, and 4f miles southeast of Keanae post office. Records available.- July 1932 to June 1938. Records at same site obtained by East Maul Irrigation (Jo. June 1931 to June 1932. Extremes.- Maximum discharge during year, 2.1 million gallons a day (3.25 second-feet) Apr. 6 (gage height, 0.67 foot); minimum, 0.50 million gallons a day (0.77 second- foot) Dec. 1-7. 1932-38: Maximum discharge, 32 million gallons a day (50 second-feet) Feb. 25, 1935 (gage height, 2.93 feet], from rating curve 'extended above 1.5 million gallons a day by weir formulas; no flow In dry weather. Remarks.- Records good except those for period of missing gage heights, Apr. 14-24, which were computed on basis of records for stations on nearby streams and are fair. No diversions.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.3 0.40 0.6 1.75 .79 .7 2.25 1.2.6

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 1.26 1.31 1.65 1.41 0.88 0.54 0.88 1.12 1.17 0.88 1.80 1.46 2 1.26 1.31 1.65 1.36 .88 .50 .88 1.07 1.17 .98 1.85 1.50 3 1.21 1.41 1.65 .36 .84 .50 .88 1.07 1.17 1.02 1.85 1.50 4 1.21 1.36 1.65 .36 .84 .50 .88 1.02 1.21 1.07 1.85 1.46 5 1.21 1.36 1.60 .36 .79 .50 .84 1.02 1.17 1.17 1.80 1.46 6 1.26 1.36 1.60 .31 .79 .00 .79 1.02 1.12 1.41 1.75 1.41 7 1.26 1.36 1.60 .31 .79 .54 .79 .98 1.12 1.60 1.75 1.41 8 1.26 1.36 1.65 1.31 .79 .54 .79 .98 1.17 1.41 1.70 1.41 9 1.21 1.36 1.60 1.26 .79 .54 .84 .98 1.21 1.50 1.70 1.50 10 1.12 1.41 1.60 1.26 .79 .54 .79 .98 1.12 1.55 1.75 1.50 11 1.07 1.46 1.65 1.21 .84 .58 .75 1.07 1.07 1.46 1.75 1.46 12 1.07 1.46 1.60 1.17 .84 .58 .75 1.12 1.07 1.46 1.75 1.46 13 1.07 1.50 1.60 1.17 .75 .62 .75 1.12 1.02 1.46 1.70 1.46 14 1.02 1.55 1.55 1.17 .71 .71 .79 1.12 1.07 1.55 1.70 1.46 15 .98 1.70 1.60 1.17 .71 .71 .79 1.12 1.07 1.55 1.65 1.46 16 .98 1.70 1.55 1.12 .71 .71 .84 1.17 1.07 1.55 1.60 1.50 17 .98 1.65 1.55 1.07 .66 .71 .88 1.17 1.17 1.55 1.60 1.50 18 .98 1.70 1.55 1.07 .66 .75 .88 1.17 1.17 1.55 1.55 1.50 19 .98 1.70 1.55 1.07 .62 .75 .93 1.17 1.17 1.57 1.55 1.50 20 .93 1.70 1.50 1.02 .62 .75 1.02 1.17 1.07 1.60 1.55 1.50 21 1.02 1.70 1.50 1.02 .58 .79 1.02 1.17 1.02 1.64 1.75 1.50 22 1.07 1.65 1.50 .98 .66 .79 1.02 1.17 .98 1.67 1.65 1.46 23 1.02 1.65 1.50 .98 .75 .93 .98 1.21 .98 1.70 1.55 1.46 24 1.02 1.65 1.46 .98 .79 .98 1.07 1.21 .98 1.74 1.55 1.46 25 1.02 1.65 1.46 1.07 .88 1.02 .98 1.21 .93 1.77 1.55 1.46 26 1.07 1.65 1.46 .98 .75 .98 1.17 1.21 .88 1.80 1.60 1.46 27 1.07 1.65 1.41 .93 .71 .93 1.26 1.17 .84 1.80 1.55 1.46 28 1.07 1.65 1.41 .93 .62 .93 1.31 1.17 .79 1.85 1.50 1.41 29 1.12 1.65 1.36 .88 .54 1.07 1.17 .79 1.85 1.50 1.41 30 1.12 1.65 1.36 .88 .54 1.12 1.21 .79 1.80 1.50 1.41 31 1.17 1.65 .88 .98 1.17 .84 1.50

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 1.26 0.93 1.10 1.70 34.1 105 Aug 1.70 1.31 1.55 2.40 47.9 147 Sep 1.65 1.36 1.55 2.40 46.4 142 Oot 1.41 .88 1.13 1.75 35.0 108 HOT .88 .54 .737 1.14 22.1 68 Dec 1.12 .50 .729 1.13 22.6 69 C alendar year 193 2.05 .50 1.37 2.12 500 1,540 Jan 1.31 .75 .939 1.45 29.1 89 Feb 1.21 .98 1.11 1.72 31.2 96 liar 1.21 .79 1.05 1.62 32.4 99 Apr 1.85 .88 1.52 2.35 45.5 140 May 1.85 1.50 1.66 2.57 51.4 158 Jun 1.50 1.41 1.46 8.26 43.9 135 PIscal year 1937- .1.85 .50 1.21 1.87 442 1,360 ISLAND OF MAUI 69

Hanawl Stream near Nahiku

Location.- Lat. 20°48'35", long. 156°06'50n , 200 feet upstream from Koolau ditch Intake and trail, If miles southwest of Nahiku, and 4i miles southeast of Keanae. Drainage area.- 0.8 square mile. Records available.- January 1914 to January 1916, November 1921 to June 1938. Average discharge.- 16 years (1922-38), 13.1 million gallons a day (20.3 second-feet). Extremes.- Maximum discharge during year, 944 million gallons a day (1,460 second-feet) Apr. 6 (gage height, 9.47 feet), from rating curve extended above 120 million gallons a day; minimum, 2.8 million gallons a day (4.3 second-feet) Mar. 2, 3. 1914-16, 1921-38: Maximum gage height about 20 feet during flood of Jan. 18, 1916, from floodmarks (discharge not determined); minimum discharge, 1.2 million gallons a day (1.9 second-feet) Feb. 19, 1936. Remarks.- Records good except those for periods of missing gage heights, Nov. 14-30, Dec. 1, 17-20, 24 to Jan. 3, Jan. 5-12, Jan. 21 to Feb. 3, Feb. 5-21, Mar. 14 to May 3, May 27 to June 21 (computed on basis of records for Waiohue and Kapaula Streams near Nahiku), and those above 200 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul.

Eatln 4 table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day)

0.3 1.9 1.0 9.1 2.0 34 3.5 123 5.0 274 .5 3.4 1.3 14.4 2.5 58 4.0 166 6.0 400 .7 5.4 1.6 21 3.0 89 4.5 216 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. HOT. Dec. Jan. Feb. Mar. Apr. May June

1 7.2 187 6.6 14.1 13.4 5.6 8.5 9.0 3.0 5.5 17 25 2 8.8 98 7.6 12.1 7.8 5.1 8.5 7.0 3.0 10 45 26 3 14.6 49 9.9 10.9 4.5 4.8 8.5 8.0 4.6 18 25 11 4 38.5 17.6 14.7 9.3 5.0 4.8 6.1 6.6 8.9 5.5 12.4 8.5 5 34.5 12.5 10.6 9.2 4.7 6.4 20 29 5.0 7.6 7.5 6 81 10.7 7.6 5.8 7.1 4.6 6.0 8.0 4.8 300 6.4 7.0 7 41 9.9 14.6 7.8 32 4.5 17 6.5 3.5 380 5.6 10 8 11.3 13.7 14.6 9.0 67 4.3 16 6.0 88 150 6.2 30 9 7.5 29 8.1 5.4 35.5 4.2 23 5.7 38.5 180 45 120 10 6.0 54 7.0 5.0 17.0 4.0 9.0 5.5 9.2 170 69 40 11 7.8 24 12.3 4.6 26.5 3.9 7.5 9.0 7.2 70 34.5 10 12 19.7 19.9 8.2 4.2 7.6 4.0 6.9 55 11.9 100 56 9.0 13 7.2 13.4 6.5 5.9 5.5 17.4 6.2 25 22.5 17 10.2 8.0 14 14.4 26.9 6.0 4.8 4.8 48 5.8 10 50 35 7.2 17 15 14.5 89 10.4 4.3 4.4 16.9 5.4 6.0 60 15 7.9 15 16 9.3 43 6.8 3.9 4.1 6.7 5.2 5.1 73 11 6.2 16 17 13.2 20 5.8 3.8 3.8 5.0 14.6 5.3 130 9.5 5.5 11 18 10.0 16.6 5.4 4.2 3.5 4.6 7.3 5.5 150 8.5 5.4 13 19 7.8 10.5 5.6 3.8 3.2 4.3 5.3 4.5 100 8.5 8.4 17 20 26 9.4 5.1 3.3 3.0 4.0 44 4.3 35 8.0 34.5 10 21 49 8.7 4.7 3.2 50 3.7 12 4.1 21 7.2 134 8.0 22 30 8.2 4.8 3.4 50 3.6 6.5 3.9 15 6.6 21.5 7.0 23 13.4 15.6 13.9 4.7 45 40 6.0 3.8 22 6.4 36 6.2 24 21 8.6 6.2 18.4 40 33 60 3.7 14 6.2 27.5 5.8 25 17.1 10.4 8.0 10.4 35 30 20 3.5 8.5 7.5 13.0 5.4 26 12.0 14.8 5.2 4.8 6.5 65 150 3.3 7.5 6.2 50 5.1 27 13.0 .10.5 4.7 4.1 6.3 25 130 3.2 7.0 25 15 13.1 28 9.3 14.8 4.4 3.9 6.0 20 140 3.1 6.5 18 11 10.8 29 20.5 9.6 5.5 7.0 7.5 170 18 6.2 6.8 35 5.8 30 16.1 8.7 4.6 6.6 6.3 130 40 5.8 6.2 25 5.3 31 146 7.2 6.0 25 15 5.5 14

Million gallona a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallona Acre-feet Jul 146 6.0 23.5 36.4 728 2,230 Augi 187 7.2 28.1 43.5 871 2,670 Sep 14.7 4.4 7.77 12.0 233 715 Oet 18.4 3.2 6.62 10.2 205 630 HOT 67 3.0 17.2 26.6 518 1,590 Dee 170 3.6 22.8 35.3 707 2,170 C alendar year 193 249 3.0 23.3 36.1 8,510 26,080 Jan 150 5.2 26.3 40.7 815 2,500 Feb 55 3.1 8.59 13.3 241 738 Map 150 3.0 30.7 47.5 951 2,920 Apr 380 5.0 53.4 82.6 1,600 4,920 May 134 5.4 25.7 39.8 797 2,450 Jun 120 5.1 16.1 24.9 484 1,480 F laeal year 1937- 380 3.0 22.3 34.5 8,150 25,010 70 ISLAND OF MAUI

Hanawi Stream below Government Road, near Nahiku

Location.- Concrete control, lat. 20°49'15", long. 156°06'25", three-quarters of a mile southwest of Nahiku and 4 miles southeast of Keanae post office. Altitude, 500 feet, by barometer. Drainage area.- 1.6 square miles. Records available.- July 1932 to June 1938. Records at same site obtained by East Maui Irrigation Co. January 1927 to June 1932. Extremes.- Maximum discharge recorded during year, 5,740 million gallons a day (8,880 second-feet) Feb. 12 (gage height, 8.75 feet), from rating curve extended above 28 million gallons a day; minimum recorded, 13.8 million gallons a day (21.4 second-feet) Mar. 3. 1932-38: Maximum discharge, 7,180 million gallons a day (11,100 second-feet) Mar. 21, 1937 (gage height, 9.54 feet); minimum, 8.2 million gallons a day (12.7 second- feet) Feb. 25, 26, 1936. Flood that destroyed shelter Apr. 6 or 7, 1938, probably reached a higher stage than 9.54 feet, the maximum given. Remarks.- Records excellent excellent except those for periods of missing gage heights, JJec. 31, Jan. 1-4, Feb. 2-4, Mar/ 29 to June 30, which were computed on basis of rec­ ords for stations on nearby streams and are poor. Entire flow of stream above station up to 25 million gallons a day is diverted by the East Maui Irrigation Co.'s ditch at altitude 1,300 feet for irrigation in central Maui.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.8 8.6 1.8 80 3.5 1.0 15.7 2.0 106 4.0 696 1.2 26.5 2.2 140 4.5 955 1.4 40 2.5 198 5.0 1,260 1.6 59 3.0 322 5.5 1,630 Discharge, In million gallons fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 14.9 522 16.2 22 17.6 15.7 35 19.5 14.1 14.5 16 35 2 15.3 237 16.2 16.2 15.7 15.7 25 18 14.1 14.5 200 40 3 15.7 115 16.2 15.7 15.3 15.7 20 17 14.5 25 100 19 4 29.5 32.5 16.2 17.0 15.3 15.7 18 16 18.4 15 50 17 S 36 23.5 16.2 17.1 15.7 15.7 16.2 21.5 24.5 14.5 20 16 6 134 19.5 16.2 15.7 15.3 15.7 15.7 16.2 14.5 800 17 16 7 49 17.6 18.6 17.1 41 15.7 22.5 15.7 14.5 500 16 16 8 20.5 17.1 18.7 17.6 94 15.7 32. 5 15.7 199 700 16 16 9 18.1 25 16.7 16.7 40 15.7 52 15.7 67 400 150 300 10 17.1 75 16.7 16.2 21 15.7 15.7 15.3 16.7 400 300 150 11 17.1 31.5 17.6 16.2 32.5 15.7 15.7 17.1 15.3 200 150 25 12 19.6 25 17.1 15.7 17.1 15.7 15.3 272 14.5 200 150 17 13 16.7 19.1 16.7 16.2 16.7 20.5 15.3 80 18.0 100 50 16 14 17.9 24.5 16.7 15.7 16.2 65 15.3 19.8 33 150 25 25 IS 17.3 208 18.9 15.7 16.2 23.5 15.3 16.7 57 100 19 22 16 16.7 96 17.1 15.7 15.7 16.2 15.3 15.3 74 50 16 24 17 17.6 30 16.7 15.7 15.7 15.7 20.5 15.3 302 30 16 17 18 16.7 32 16.2 16.2 IS. 7 15.7 15.3 15.3 366 21 16 16 19 16.7 21 16.2 15.7 15.7 15.7 14.9 14.9 253 17 150 23 20 26.5 18.1 16.2 15.7 15.7 15.3 91 14.9 62 16 250 16 21 65 17.6 16.7 15.7 63 14.9 22 14.9 32.5 16 400 16 22 34.5 17.6 15.7 15.7 59 15.3 15.3 14.9 19.5 16 100 15.5 23 18.6 18.4 20 15.7 62 68 17.6 14.5 27.5 16 50 15.5 24 23 16.7 15.7 32 90 64 120 14.5 19.1 16 100 15.5 25 19.5 16.2 16.2 19.2 107 126 33 14.5 15.3 16 90 15.5 26 18.6 17.4 16.2 16.2 21 247 442 14.5 14.5 16 250 15.5 27 18.6 16.7 16.2 15.7 17.6 50 404 14.5 14.5 28 150 18 28 17.6 17.1 16.2 15.3 16.2 33 574 14.1 14.5 17 30 15.5 29 23.5 16.2 15.7 15.7 16.2 507 38 14.5 16 40 15 30 18.1 16.2 15.7 16.2 15.7 593 105 14.5 16 50 15 31 345 16.2 15.3 70 25 14.5 20

Million gallons a day Second- Total run-off Month feet (mean) Million Acre -feet Uaxlunm Minimum Mean gallons Jul 345 14.9 36.6 56.6 1,130 3,480 Aug 522 16.2 57.3 88.7 1,780 5,450 Sep 20 15.7 16.7 25.8 502 1,540 Dot 32 15.3 16.9 26.1 522 1,600 HOT 107 15.3 31.2 48.3 936 2,870 Dec 593 14.9 69.8 108 2,160 6,640 C 849 12.6 49.3 76.3 17,980 55,190 Jan 574 14.9 73,6 114 2,280 7,000 Peb 272 14.1 27.4 42.4 768 2,360 Mar 366 14.1 57.8 89.4 1,790 5,500 Apr 1,500 14.5 165 25S 4,940 15,160 May 400 16 97.0 150 3,010 9,230 June...... 300 15 32.8 SO. 7 983 3,020 PIscal year 1937- 1,500 14.1 57.0 88.2 20,800 63,850 ISLAND OF MAUI 71

Kapaula Stream near Nahlku

Location-.- Lat. 20°48'50", long. 156°07'05", 40 feet upstream from Intake to Koolau ditch, 300 reet upstream from ditch trail, If miles southwest of Nahiku, and 4 miles south­ east of Keanae. Drainage area.- 0.2 square mile. Records available.- November 1921 to June 1938. Average discharge.- 16 years (1922-38), ll.o million gallons a day (17.0 second-feet). Extremes.- Maximum discharge during year, 1,780 million gallons a day (2,750 second-feet) APr. 6 (gage height, 8.40 feet), from rating curve extended above 140 million gallons a day; minimum, 1.5 million gallons a day (2.3 second-feet) Dec. 11. 1921-38: Maximum discharge, that of Apr. 6, 1938; minimum, 0.2 million gallons a day (0.3 second-foot) Nov. 23-25, 1933. Remarks.- Records excellent except those above 200 million gallons a day, which are poor, wo diversions. Water used for Irrigation In central Maul.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day) 0.5 1.1 1.4 18.6 2.8 106 .6 2.1 1.6 25 130 .S 4.8 1.8 212 1.0 8.6 2.0 4.0 320 1.2 13.3 2.4 4.5 448

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 7.4 144 4.6 12.1 13.7 2.9 5.7 4.4 1.6 3.2 12.6 19.4 2 9.7 65 6.7 13.3 6.5 2.5 4.5 3.4 1.6 6.7 38.5 21.5 3 17.4 34 8.5 11.9 2.9 2.2 5.3, 4.1 3.7 14.5 21 7.2 4 34 12.3 14.3 11.1 3.5 2.0 3.3 2.9 10.0 4.6 13.4 4.5 5 30.5 9.5 9.0 10.6 10.4 2.0 4.8 15.1 10.9 3.6 5.9 3.8 6 67 7.2 6.6 4.4 8.0 1.9 3.2 4.6 3.3 232 4.0 3.3 7 36 5.9 12.8 8.3 18.3 1.8 15.3 3.1 2.2 354 3.6 6.5 8 11.3 8.9 16.0 8.1 37 1.8 13.5 2.9 74 120 4.2 16.2 9 6.3 24 7.0 3. -6 26.5 1.7 16.7 2.8 30.5 148 44 92 10 4.2 35 5.2 3.1 14.9 1.5 4.0 2.8 8.4 134 52 30 11 6,0 19.0 11.5 2.8 25 1..5 3.1 5.5 6.2 48 28.5 7.0 12 21 14.5 7.4 2 .6 8.0 1.6 2.7 44 9.0 77 40 4.6 13 7.2 10.4 4.5 4.4 4.2 12.3 2.5 20 23 13.5 11.4 4.2 14 13.5 17.5 3.8 3.4 3.4 43 2.3 4.8 37.5 33 5.9 13.8 15 13.3 72 10.2 2.8 3.1 15.9 2.3 3.4 47 12.8 6.6 11.8 16 9.4 27.5 6.0 2.5 2.7 5.0 2.1 3.1 53 9.2 4.4 12.7 17 12.5 15.6 3.8 2.1 2.5 2.9 13.2 2.9 100 7.2 3.4 8.3 18 7.4 15.7 3.3 3.0 2.3 2.5 7.1 3.1 118 6.2 3.2 10.6 19 4.4 8.6 3.6 2.3 2.1 2.0 3.2 2.7 80 7.2 7.0 14.3 20 22 7.0 3.1 1.9 2.0 1.9 14.1 2.3 26 6.8 36 6.8 21 38.5 6.1 2.8 1.7 39 1.8 7.6 2.2 17.7 5.9 108 6.7 22 22.5 5.2 2.9 1.8 40 1.7 3.2 2.0 12.7 5.5 15.4 4.5 23 11.3 13.7 13.0 3.1 37.5 39 2.7 1.9 18.2 5.3 28.5 3.3 24 17.4 7.3 5.3 17.2 33.5 31 42 1.9 11.6 4.8 20.5 3.1 25 15.0 9.5 6.4 11.1 31 28.5 12.4 1.8 5.9 6.1 11.6 2.7 26 10.8 13.2 3.3 3.1 5.9 50 120 1.7 4.2 5.0 40 2.6 27 10.3 11.8 2.8 2.5 3.8 20 101 1.7 3.6 19.1 9.6 9.5 28 6.2 14.7 2.6 2.1 3.1 15.0 114 1.6 3.3 13.6 8.4 10.4 29 15.8 9.8 4.3 4.7 4.2 130 12.6 3.2 5.5 26 3.6 30 14.2 8.3 3.2 6.4 3.2 102 29 3.2 4.5 19.0 2.9 31 112 5.5 5.7 18.4 8.0 3.1 11.4

Million gallons a day Second- Total run-off Month feet (mean) Million MmclMum Minimum Mean gallons Acre-feet Jul 112 4.2 19.8 30.6 614 1,890 Aug< 144 5.2 21.2 32.8 659 2,020 Sep 16.0 2.6 6.48 10.0 194 597 Oct 17.2 1.7 5.60 8.66 174 533 HOT 40 2.0 13.3 20.6 398 1,220 Dec 130 1.5 17.6 27.2 546 1,680 C alendar year 193 148 1.5 17.3 26.8 6,320 19,410 Jan 120 2.1 18.8 29.1 581 1,780 Fet) 44 1.6 5.45 8.43 153 4S9 Mar 118 1.6 23.6 36.5 733 2,250 Apr 354 3.2 43.9 67.9 1,320 4,040 May 108 3.2 20.8 32.2 644 1,980 Jun 92 2.6 11.6 17.9 348 1,070 F lacal year 1937- 354 1.5 17.4 26.9 6,360 19,530 '^ ISLAND OF MAUI

Kapaula Stream below Government Road, near Nahiku

Location.- Concrete control, lat. 20°49'25", long. 156°06'55", 3,000 feet downstream from highway, 1.3 miles southwest of Nahiku, and 3.8 miles from Keanae post office. Altitude, 620 feet, by barometer. Drainage area.- 0.5 square mile. Records available.- July 1932 to June 1938. Records at same site obtained by East Maul Irrigation Co. March 1927 to June 1932. Extremes.- Maximum discharge during year, 960 million gallons a day (1,490 second-feet) Apr. 7 (gage height, 5.00 feet), from rating curve extended above 10 million gallons a day; minimum, 1.3 million gallons a day (2.0 second-feet) Dec. 13. 1932-38: Maximum discharge, that of Apr. 7, 1938; minimum, 1.1 million gallons a day (1.7 second-feet) several days in August 1934 and January 1935. Remarks.- Records good except those for periods of missing gage heights, Feb. 3-5, May 17-23, which were computed on basis of records for station on Waiaaka Stream and are fair, and those above 100 million gallons a day, which are poor. Koolau ditch diverts water 4,000 feet above station, at 1,300 feet altitude, for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in mlllio gallons a day) 0.2 0.7 0.6 8.0 1.2 2.0 123 .3 1.6 .7 11.4 1.4 2.5 204 .4 3.2 15.6 1.6 3.0 305 .5 5.3 1.0 26 1.8 97 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 1.6 93 1.6 6.0 6.5 1.8 3.8 2.2 1.4 1.6 3.2 12.7 2 2.9 54 1.6 3.5 2.4 1.5 2.1 1.9 1.4 1.6 28.5 18.0 3 4.2 35 2.5 1.5 1.8 1.4 2.4 1.8 1.6 8.1 18.8 2.6 4 22.5 16.1 4.9 3.6 1.9 1.4 1.9 1.7 5.2 1.8 10.6 2.2 5 19.6 11.0 2.1 3.5 2.7 1.4 1.9 3.5 6.5 1.6 2.1 2.1 6 55 5.4 1.6 1.6 2.1 1.4- 1.9 2.2 1.8 171 1.9 1.9 7 28 2«9 5.0 3.4 7.9 1.4 6.9 2.1 1.6 273 1.8 2.6 8 6.4 4^5 9.2 4.8 25 1.4 2.4 1.9 46 77 1.6 8.0 9 2.4 21 1.9 1.5 13.0 1.4 20 1.9 34 140 29 80 10 1.9 35 1.6 1.5 7.6 1.4 1.8 1.9 2.4 133 52 35.5 11 1.8 22 6.0 1.4 20 1.4 1.6 3.0 1.9 57 27 7.3 12 10.4 17.6 2.2 1.3 3.0 1.4 1.5 32.5 2.5 80 37 2.4 13 2.1 9.7 1.6 1.8 2.1 1.3 1.5 16.3 14.6 37.5 6.7 1.9 14 6.1 20 1.6 1.6 1.9 26.5 1.5 2.2 29.5 54 2.4 8.5 15 4.6 64 6.6 1.5 1.8 13.7 1.4 1.9 35.5 41 1.9 7.6 16 2.7 30.5 2.1 1.6 1.8 2.1 1.4 1.9 36 15.0 1.8 8.0 17 7.7 17.0 1.6 1.6 1.8 1.6 5.5 2.1 78 2.6 1.7 2.7 18 3.2 18.1 1.6 1.6 1.6 1.5 1.8 2.2 93 2.6 1.6 4.6 19 1.6 6.2 1.8 1.6 1.6 1.4 1.6 1.9 66 2.2 25 8.5 20 11.7 2.6 1.5 1.5 1.6 1.4 24.5 1.8 26 2.1 60 2.1 21 37.5 2.1 1.5 1.5 23.5 1.4 4.6 1.8 17.5 1.9 100 1.8 22 23.5 1.9 1.6 1.5 25.5 1.5 1.6 1.8 10.8 1.9 12 1.6 23 8.0 6.7 4.0 1.6 31.5 24 1.6 1.8 17.4 1.8 11 1.6 24 15.4 2.4 1.9 11.4 33.5 22 21 1.6 10.6 1.8 11.9 1.6 25 16.0 1.8 1.8 9.0 31 30.5 1.8 1.5 3.0 1.8 5.5 1.5 26 9.0 4.0 1.5 1.9 4.1 36 71 1.5 1.8 1.6 40 1.4 27 7.2 2.7 1.5 1.6 2.4 17.0 85 1.4 1.8 9.5 12.0 3.2 28 2.7 4.9 1.4 1.6 1.9 11.3 104 1.4 1.8 5.5 11.2 2.2 29 12.6 2.7 1.4 1.9 1.9 93 19.0 1.8 1.6 14.9 1.6 30 11.8 2.2 1.4 2.9 1.8 129 34 1.8 1.6 22 1.5 31 76 1.6 1.9 20.5 7.3 1.6 3.2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 76 1.6 13.4 20.7 416 1,280 Aug 93 1.6 16.7 85.8 519 1,590 Sep 9.2 1.4 2.58 3.99 77.4 238 Oct 11.4 1.3 2.68 4.15 83.2 255 NOT 33.5 1.6 8.84 13.7 265 814 Dec 129 1.3 14.6 22.6 453 1,390 C alendar year 193 7 ...... 129 1.3 13.5 20.9 4,740 14,540 Jan 104 1.4 14.1 21.8 438 1,350 Fob 32.5 1.4 3.56 5.51 99.7 306 Mar 93 1.4 17.9 27.7 555 1,700 Apr 273 1.6 37.7 58.3 1,130 3,470 May 100 1.6 18.0 27.9 558 1,710 Jun 80 1.4 7.91 12.2 237 728 PIscal year 1937- 273 1.3 13.2 20.4 4,830 14,830 ISLAND OF MA.UI 73

Koolau ditch at Nahiku weir, near Nahlku

Location.- Lat. 20°48'55", long. 156°07'15", between Kapaula and Waiohue Streams, 34 miles southwest of Nahiku and 4 miles southeast of Keanae. Records available.- February 1919 to June 1938. Average discharge.- 19 years (1919-38), 21.2 million gallons a day (32.8 second-feet). Extremes.- Maximum discharge during year, 56 million gallons a day (87 second-feet'i Jan. 30 (gage height, 1.62 feet); no flow Apr. 9-16, Hay 26-28, 30. 1919-38: Maximum discharge, 61 million gallons a day (94 second-feet) May 3, 1934 (gage height, 1.68 feet); no flow occasionally, when intake gates are closed. Remarks.- Records excellent except those for period of missing gage heights, Feb. 1-4, which were computed on basis of records for station at Haipuaena and stations near Huelo and Keanae and are good. Flow regulated by spillways and gates. Ditch diverts water, at altitude of about 1,200 feet, from nearly all streams from the Makaplpi west to the Alo. Water used for irrigation In central Maui.

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June 1 21.5 50 26 30.5 38 21 42 29 10. S 27.5 38 4S 2 26.5 50 29.5 35.5 26.5 19.2 38 28 10.2 33.5 48 4S 3 38 50 33.5 35.5 19.2 18.1 35.5 31 15.3 40 48 35.5 4 48 48 40 33.5 19.9 17.0 29.5 25.5 31 27 45 33.5 5 48 48 31 33.5 31 16.4 30.5 38 40 23.5 38 35.5 6 50 45 29 22 25 15.6 25.5 27 17.0 40 30.5 31 7 48 42 38 29 35.5 15.0 40 24 13.0 38 26 35.5 8 45 45 40 33.5 45 14.6 35.5 25.5 33.5 43 26 45 9 35.5 48 33.5 22 45 14.0 40 22.5 42 11.2 40 52 10 29 50 27.5 20.5 38 13.3 28 22.5 33.5 0 48 50 11 31 48 40 18.8 45 13.0 25 33,5 25.5 0 45 48 12 42 48 33.5 17.0 33.5 13.3 23 38 33.5 0 48 40 13 30 48 26 22.5 25 23.5 21.5 40 45 0 40 35.5 14 38 48 23.5 19.9 21.5 48 20.5 31 48 4.0 27 45 15 40 50 35.5 17.8 19.5 40 18.8 27 48 0 35.5 45 16 35.5 50 27.5 16.4 17.4 26.5 18.1 23.5 43 22 28 45 17 45 48 22 15.3 16.0 21 30 22.5 50 35.5 24.5 42 18 40 48 20.5 16.7 14.6 18.1 25.5 21.5 50 42 23.5 42 19 31 45 21.5 14.6 13.6 16.7 19.9 18.8 48 45 28.5 45 20 45 42 17.8 13.3 13.0 15.3 27.5 17.4 48 42 33.5 38 21 50 38 17.8 12.7 32.5 14.6 31 16.0 48 40 34.5 34.5 22 50 35.5 17.4 13.3 48 14.3 19.9 15.0 45 38 17.0 29.5 23 48 40 33.5 17.0 48 40 13.0 14.3 48 35.5 19.2 25.5 24 48 35.5 22.5 31 50 45 35.5 13.3 45 31 23.5 24 25 48 38 25.5 35.5 48 45 26.5 12.7 42 33.5 32 22 26 48 40 18.4 20.5 40 48 45 11.7 38 29.5 35 21 27 45 38 17.0 17.0 33.5 48 52 11.4 35.5 40 23.5 35.5 28 40 45 15.6 15.6 28 45 52 10.8 33. 5 35.5 25 35.5 29 45 38 18.1 20.5 27.5 50 48 31 26.5 45 22 30 48 35.5 16.0 24 23 50 45 30 24.5 30.5 20.5 31 43 29 22.5 48 37 28.5 42

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 50 21.5 41.5 64.2 1,280 3,940 Aug 50 29 44.0 68.1 1,360 4,180 Sep 40 15.6 26.6 41.2 798 2,450 Oct 35.5 12.7 22.5 34.8 697 2,140 Hov 50 13.0 30.7 47.5 921 2,830 Dec 50 13.0 27.3 42.2 848 2,600 C alendar year 193 55 12.7 35.9 55.5 13,090 40,180 Jan 52 13.0 31.6 48.9 979 3,010 Fob 40 10.8 23.2 35.9 649 1,990 Mar 50 10.2 36.0 55.7 1,110 3,420 Apr 45 0 26.9 41.6 808 2,48O May 48 17.0 33.8 52.3 1,050 3,220 Jun 52 20.5 37.0 57.2 1,110 3,400 Fiacal year 1937-38 ...... 52 0 31.8 49.2 11,610 155,660 ISLAND OF MAUI

Waiaaka Stream near Nahiku

Location.- Concrete control, lat. 20°49'25", long. 156°07'00", 3,000 feet downstream from Government Road, li miles west of Nahiku, and 34 miles southeast of Keanae post office. Altitude, about 650 feet, by barometer. Drainage area.- 0.1 square mile. Records available.- July 1932 to June 1938. Records at same site obtained by East Maul Irrigation Co. March 1927 to June 1932. Extremes.- Maximum discharge recorded during year, 31.5 million gallons a day (48.7 second-feet) Apr. 7 (gage height, 2.04 feet, present datum), from rating curve extend­ ed above 14 million gallons a day by tests on model of station site; minimum dis­ charge, 0.35 million gallons a day (0.54 second-foot) July 1, 2. 1932-38: Maximum discharge, 73 million gallons a day (113 second-feet) Mar. 6, 1933 (gage height, 1.87 feet, former datum), from rating curve extended above 1 mil­ lion gallons a day by formula for V-notch weirs; minimum, 0.30 million gallons a day (0.46 second-foot) several days in October and November, 1933, and April, May, and June, 1934. Remarks.- Records good except those for periods when clock was not running, July 26 to Aug. 3, Dec. 29 to Jan. 11, Jan. 29 to Feb. 5, 11-15, Apr. 10-12, June 7-14, which were computed on basis of records for stations on nearby streams and are poor. No diversions.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge. In million gallons a day) 0.3 0.24 0.6 2.0 1.0 7.5 .4 .58 .7 3.15 .5 1.14 .8 4.4 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. Bay June

1 0.38 3.5 0.54 1.10 1.32 0.72 1.2 0.86 0.42 0.5S 0 .72 1.42 2 .38 2.5 .58 .77 .79 .67 1.0 .78 .42 .54 1 .03 1.81 3 .61 1.5 .62 .72 .67 .67 .90 .74 .50 .62 1 .21 .95 4 .61 1.14 .58 1.09 .72 .58 .80 .70 1.62 .54 1 .02 .63 5 .50 1.02 .58 1.09 .94 .58 .75 .90 .83 .50 .72 .72 6 1.44 .95 .58 .67 .72 .58 .72 .67 .62 5.0 .72 .72 V .83 .89 .67 1.44 .72 .50 .72 .67 .58 5.8 62 .72 8 .67 .83 .72 1,02 1.56 .50 2.3 .62 .88 1.37 .62 .90 9 .62 .83 .67 .67 .67 .50 1.0 .58 1.42 5.1 2 7 4.0 10 .58 .92 .58 .67 .83 .50 .70 .58 .83 4.5 1 22 3.0 11 .54 .77 1.04 .62 2.25 .50 .63 .85 .72 4.2 1 44 .80 12 .54 .89 .72 .54 .77 .46 .58 1.8 .72 4.7 1 91 .75 13 .54 .72 .62 .83 .67 .42 .58 1.2 1.04 3.65 1 .02 .70 14 .54 .99 .58 .72 .67 .58 .54 .80 .89 4.3 .95 .90 15 .58 3.7 2.05 .62 .62 .72 .54 .72 .77 3.1 77 .77 16 .62 1.83 .67 .58 .58 .58 .50 .67 .77 1.45 .72 .72 17 .89 .95 .58 .58 .58 .50 .58 .72 1.67 1.08 .67 .62 18 .62 1.28 .58 .62 .54 .46 .54 .83 2.3 .95 .67 .62 19 .58 .89 .67 .54 .54 .46 .54 .62 1.30 .89 1 .21 .62 20 .58 .83 .58 .50 .50 .46 1.98 .62 1.14 .77 1 .39 .58 21 3.15 .77 .58 .50 1.42 .42 .67 .58 .95 .77 5 .3 .62 22 1.12 .72 .58 .50 .95 .46 .54 .58 .95 .67 1 .37 .58 23 .77 .67 .94 ,50 1.27 1.33 .50 .50 .89 .67 1 .30 .58 24 .97 .67 .58 1.44 2.05 1.48 .73 .46 .83 .62 2 25 .58 25 1.52 .62 .74 1.25 2.9 1.87 .54 .46 .77 .62 1 99 .58 26 1.0 .58 .58 .62 1.08 1.10 1.56 .46 .72 .58 3 5 .54 2V .90 .58 .54 .58 .95 1.28- 2.45 .46 .67 .72 1 71 .54 28 .80 .92 .50 .58 .89 1.58 3.5 .46 .67 .58 1 89 .58 29 1.8 .76 .50 .74 .83 5.0 1.1 .58 .58 1 06 .50 30 .90 .64 .50 .67 .77 3.0 2.0 .58 .54 1 81 .50 31 2.0 .58 .73 2.0 1.0 .58 89

Million gallons a day Second- Total run-off Month feet (mean) Million Acre.-feet Maximum Minimum Mean gallons Jul 3.15 0.38 0.890 1.38 27.6 85 Aug 3.7 .58 1.11 1.72 34.4 106 Sep 2.05 .50 .675 1.04 20.2 62 Oct 1.44 .50 .758 1.17 23.5 72 HOT 2.9 .50 .992 1.53 29.8 91 Dec 5.0 .42 .983 1.52 30.5 93 C alendar year 193 7 ...... 10.3 .38 1.11 1.72 404 1,240 Jan 3.5 .50 1.02 1.58 31.7 97 Feb 1.8 .46 .710 1.10 19.9 61 Mar 2.3 .42 .891 1.38 27.6 85 Apr 5.8 .50 1.87 2.89 56.0 172 Hay 5.3 .62 1.43 2.21 44.4 136 Jun 4.0 .50 .925 1.43 27.8 85 PIscal year 1937- 5.8 .38 1.02 1.58 373 1,140 ISLAND OF MAUI 75

Paakea Stream near Nahiku

Location.- Concrete control, lat. 20°49'25", long. 156°07'05", 3,000 feet downstream from highway, 14 miles west of Nahiku, and 3i miles southeast of Keanae post office. Altitude, 650 feet, by barometer. Drainage area.- 0.5 square mile. Records available.- July 1932 to June 1933. Records at same site obtained by East Maul Irrigation Co. March 1927 to June 1932. Extremes.- Maximum discharge during year, 220 million gallons a day (340 second-feet) Apr. 7 (gage height, 5.25 feet), from rating curve extended above 20 million gallons a day; minimum, 2.3 million gallons a day (3.6 second-feet) July 1, 2, Oct. 20-.33. 1932-38: Maximum discharge, 234 million gallons a day (362 second-feet) May 2, 1937 (gage height, 5.48 feet), from rating curve extended above 20 million gallons a day; minimum, 1.8 million gallons a day (2.8 second-feet) Feb. 18, 19, 1936. Remarks.- Records excellent except those for periods of missing gage heights, Dec. 17-21, Feb. 3-5, May 9-23 (computed on basis of records for stations on Makapipi and Waiaaka Streams), and those above 30 million gallons a day, which are fair. Koolau ditch diverts all low flow at altitude of about 1,200 feet for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day) 0.4 1.6 10.9 2.2 .5 3.0 14.7 2.5 .6 4.9 1.0 18.0 .7 7.4 1.2 2.0 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June

1 2.3 27 2.5 6.4 4.7 3.2 4.1 4.0 2.5 2.8 3.0 4.5 2 2.5 30 2.5 4.1 3.2 3.0 4.0 3.6 2.5 3.0 11.4 9.9 3 3.2 16.2 2.8 3.4 2.8 3.0 3.4 3.4 3.0 4.2 6.5 3.8 4 6.0 4.1 2.8 5.2 2.8 2.8 3.0 3.3 6.4 2.8 4.6 3.4 5 3.2 3.8 2.7 3.6 3.5 2.8 3.0 4.2 5.4 2.8 3.4 3.2 6 13.1 3.6 2.7 3.0 2.8 2.7 2.8 3.4 3.2 46 3.2 3.0 7 3.9 3.4 4.8 5.8 3.1 2.5 3.0 3.2 3.0 68 3.0 8.8 8 3.2 3.4 3.2 4.5 5.2 2.5 7.9 3.2 17.5 23.5 3.2 3.7 9 2.8 4.0 2.8 3.0 3.0 2.5 3.9 3 £ 10.8 37.5 10 25.5 10 2.7 14.3 2.7 3.0 3.3 2.5 2.8 3^2 4.0 34.5 20 16.3 11 2.7 3.8 5.2 2.8 10.1 2.5 2.7 4.5 3.6 17.8 10 3.6 12 2.8 4.3 3.0 2.7 3.2 2.5 2.7 19.4 3.4 27.5 15 3.4 13 2.7 3.6 2.7 3.1 3.0 5.0 2.7 8.1 5.5 11.2 7.0 3.2 14 2.9 6.4 2.7 3.0 2.8 9.4 2.5 3.8 4.1 23.5 5.0 4.4 15 2.8 20.5 7.6 2.7 2.7 4.0 2.5 3.2 3.6 12.8 4.4 3.6 16 2.8 9.6 3.0 2.5 2.7 3.0 2.5 3.2 3.4 7.8 4.2 4.3 17 7.2 4.6 2.8 2.5 2.7 2.8 4.0 3.2 17.2 5.4 4.1 3.4 18 3.0 6.1 2.8 2.5 2.7 2.7 2.7 3.4 21.5 3.8 4.0 3.4 19 2.8 3.4 3.0 2.5 2.5 2.6 2.7 3.0 17.8 3.6 10 6.6 20 2.7 3.2 2.7 2.3 2.5 2.5 6.0 2.8 5.6 3.4 12 3.2 21 20 3.0 2.7 2.3 11.0 2.5 4.1 2.8 4.8 3.2 40 2.8 22 9.3 2.8 2.7 2.3 8.6 2.5 2.7 2.8 4.0 3.0 5.2 2.8 23 3.4 3.4 4.6 2.5 10.6 11.0 2.5 2.7 5.7 3.0 5.0 2.7 24 4.1 2.8 3.0 10.8 14.6 10.8 5.2 2.7 3.6 3.0 6.3 2.7 25 5.3 2.8 3.0 3.5 12.9 8.4 3.0 2.7 3.4 2.8 4.5 2.7 26 4.0 3.0 2.7 2.7 4.3 10.8 22.5 2.7 3.2 2.7 21.5 8.5 27 4.0 2.8 2.7 2.7 4.0 7.3 30 2.7 3.0 5.0 6.6 3.9 28 3.2 3.4 2.5 2.7 3.6 17.2 29 2.5 3.0 2.8 5.1 3.2 29 5.7 3.2 2.5 4.2 3.6 48 6.7 2.8 2.7 9.0 2.5 30 3.6 3.0 2.5 3.0 3.2 37 11.0 2.8 2.7 7.1 2.5 31 18.6 2.5 3.4 10.2 4.9 2.8 4.3

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum lie an gallons Acre -feet Jul 20 2.3 5.05 7.81 156 480 AugiJsi:::::::::::::::::::::::::: 30 2.5 6.71 10.4 208 638 Sep 7.6 2.5 3.13 4.84 93.9 888 Oct 10.8 2.3 3.51 5.43 109 334 HOT 14.6 2.5 4.86 7.52 146 447 Dec 48 2.5 7.43 11.5 230 706 C alendar year 193 7 ...... 48 2.2 5.80 8.97 2/120 6,500 Jan 30 2.5 6.15 9.52 190 585 Peb 19.4 2.5 3.96 6.13 111 340 Mar SI. 5 2.5 5.91 9.14 183 562 Apr- 68 2.7 12.4 19.2 373 1,140 May 40 3.0 8.34 12.9 259 794 Jun 25.5 2.5 4.78 7.40 144 440 P Iscal year 1937- 68 2.3 6.03 9.33 2,200 6,750 76 ISLAND OF MUI

Waiohue Stream near Nahiku

Location.- Lat. 20°49'05", long. 156°07'40", 200 feet upstream from intake to Koolau ditch, 300 feet upstream from ditch trail, 2i miles southwest of Nahiku, and 3i miles southeast of Keanae. Drainage area.- 1.5 square miles. Records available.- October 1921 to June 1938. Average discharge.- 16 years (1922-38), 8.42 million gallons a day (13.0 second-feet). Extremes.- Maximum discharge during year, 760 million gallons a day (1,180 second-feet) Apr. 7 (gage height, 6.24 feet), from rating curve extended above 50 million gallons a day; minimum, 2.85 million gallons a day (4.41 second-feet) Feb. 28, Mar. 1-3. 1921-38: Maximum discharge, that of Apr. 7, 1938; minimum, 1.4 million gallons a day (2.2 second-feet) Nov. 25, 1933. Remarks.- Records excellent except those for periods when clock was not running, July 31 to Aug. 3, Feb. 2, 3, May 4, 5, May 27 to June 5, June 12 (computed on basis of rec­ ords for stations on all nearby streams), and those above 100 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul.

Rating table fiscal year 1937-38 (gage height, in fe 3t, and discharge, in millio gallons a day) 2.85 1.1 33.5 3.0 3.8 1.2 10.6 2.0 45 3.5 5.1 1.4 16.3 2.2 59 1.0 6.6 1.6 24 2.6 93 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 5.3 85 5.7 8.0 8.8 5.1 7.1 6.1 2.85 4 6 9.0 15 2 5.3 35 6.8 8.3 5.1 4.7 7.6 5.4 2.85 5 3 20.5 16 3 8.4 20 8.0 8.1 4.1 4.4 7.4 6.0 4.1 8 4 13.3 8.0 4 15.6 11.4 10.0 8.1 4.6 4.3 5.7 5.0 8.7 4 4 8.0 6.5 5 16.5 9.7 6.4 7.2 7.2 4.2 6.0 10.2 7.0 4 1 6.0 6.0 6 31 8.4 6.0 5.0 5.2 3.9 5.1 5.0 3.7 140 5.4 5.7 7 17.7 7.3 9.9 8.4 8.9 3.8 8.9 4.6 3.25 187 5.1 7.3 8 8.3 9.5 10.2 8.5 17.2 3.7 13.0 4.4 38 52 5.4 12.6 9 6.6 15.4 6.3 5.1 12.8 3.6 10.2 4.3 13.2 76 28.5 45 10 6.2 22.5 5.7 5.0 9.1 3.4 4.8 4.3 6.0 71 25 19.2 11 7.0 12.2 10.5 4.8 18.2 3.3 4.4 6.4 4.3 25.5 16.0 *6.6 12 12.4 11.0 6.5 4.4 6.6 3.3 4.3 29 6.1 41 21.5 6.3 13 6.6 8.0 5.5 6.0 5.8 9.0 4.2 10.3 12.1 11.2 7.9 6.2 14 10.1 14.9 5.4 5.1 5.6 22 4.1 5.0 16.9 31 5.8 12.8 15 9.2 42 9.8 4.6 5.4 9.0 3.8 4.4 18.2 11.4 6.0 8.9 16 7.6 16.3 5.7 4.2 5.1 4.6 3.7 4.1 21.5 6.6 5.4 10.4 17 13.4 11.4 5.1 3.9 4.8 3.9 9.3 4.3 43 7.7 5.1 7.5 18 7.5 13.0 4.8 4.6 4.6 3.6 4.8 4.3 52 6.6 5.0 9.0 19 6.3 8.0 5.1 3.8 4.3 3.5 3.9 3.7 36 6.2 9.2 12.8 20 14.2 7.3 4.6 3.6 4.1 3.5 16.2 3.6 16.0 5.7 25.5 6.8 21 24.5 6.6 4.3 3.5 23.5 3.5 5.4 3.5 12.5 5.4 61 6.3 22 12.6 6.2 4.4 3.5 19.4 3.5 3.8 3.4 11.8 5.1 10.6 5.7 23 8.2 10.2 9.2 4.1 21 21.5 3.7 3.3 13.8 5.1 20.5 5.6 24 13.0 6.2 4.7 15.0 24 14.9 19.1 3.25 9.5 4.7 13.6 5.1 25 13.7 7.5 5.2 7.0 16.0 16.8 6.7 3.15 7.0 5.1 11.1 5.0 26 10.2 8.6 4.3 4.1 6.3 26.5 55 3.15 6.2 4.6 28 4.7 27 9.7 7.5 4.1 3.6 6.0 10.6 51 3.05 5.8 12.0 8.0 8.3 28 7.3 9.8 3.9 3.6 5.7 16.0 54 2.95 5.6 6.6 7.5 7.1 29 14.1 7.2 4.6 5.4 6.4 75 9.4 5.1 4.3 18 4.7 30 11.1 7.1 4.1 4.9 5.6 77 27 4.8 4.3 14 4.6 31 66 6.2 5.6 13.0 7.9 4.6 11

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 66 5.3 13.1 20.3 406 1,240 Aug 85 6.2 14.6 22.6 451 1,390 Sep 10.5 3.9 6.23 9.64 187 574 Oct 15.0 3.5 5.72 6.85 177 544 Hov 24 4.1 9.38 14.5 281 864 Dec 77 3.3 12.4 19.2 385 1,180 C alendar year 192 85 3.3 11.9 18.4 4,350 13,340 Jan 55 3.7 12.2 18.9 378 1,160 Fob 29 2.95 5.58 8.63 156 479 Mar 52 2.85 13.0 20.1 402 1,240 Apr 187 4.1 25.5 39.5 765 2,350 May 61 5.0 14.1 21.8 437 1,340 Jun 45 4.6 9.52 14.7 286 877 Piscal year 1937- 38 ...... 187 2.85 11.8 18.3 4,310 13,240

»Partly estimated. ISLAND OF MAUI 77

West Kopiliula Stream near Keanae

Location.- Lat. 20°40'10", long. 156°08'15", 600 feet upstream from Koolau ditch cross- ing and highway bridge and 3 miles southeast of Keanae post office. Drainage area.- 3.9 square miles. Records available.- January 1914 to September 1917, October 1921 to June 1938. Average discharge.- 14 years (1922-34, 1936-38), 20.2 million gallons a day (31.3 second- feet). Extremes.- Maximum discharge during year, 4,020 million gallons a day (6,220 second-feet) Apr. 6 (gage height, 9.12 feet), from rating curve extended above 75 million gallons a day; minimum, 2.75 million gallons a day (4.25 second-feet) Feb. 28, liar. 1, 3. 1914-17, 1921-38: Maximum discharge, that of Apr. 6, 1938; minimum, 0.6 million gallons a day (0.9 second-foot) Sept. 15-17, 1917. Remarks.- Records excellent except those for period of missing gage heights, Apr. 7 to June 20 (computed on basis of records for East Wailuaiki Stream near Keanae;, and those above 100 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul.

Rating table fiscal year 1937-38 (gage height, In feet and dlscha gallons a day) 0.4 1.70 1.0 16.7 1.7 63 3.0 255 .6 4.7 1.2 26 2.0 93 3.5 370 9.6 1.4 2.5 163 4.0 520 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 14.5 321 7.4 16.4 21.5 5.4 11.2 9.1 2.75 5.4 19 25 2 18.7 163 10.1 19.6 10. S 4.9 10.4 7.4 2.85 10.3 60 30 3 32 73 10.0 21 5.8 4.5 8.8 9.1 7.1 16.3 30 13 4 57 18.8 23.5 15.4 6.9 4.4 6.9 6.9 10.7 5.8 16 10 5 56 14.0 11.6 18.2 16.6 4.2 9.5 31.5 16.3 5.1 8.5 8.5 6 107 11.2 9.9 7.7 14.2 4.2 6.2 10.4 5.4 550 7.5 7.5 7 56 9.1 19.0 11.0 40 4.0 27 7.4 3.7 830 7.0 16 8 18.6 13.2 23 12.1 95 3.85 27 6.7 153 300 8.5 30 9 9.6 31 10.4 6.0 59 3.7 31 6.2 51 300 90 180 10 7.4 49 8.2 5.6 33.5 3.5 8.5 5.8 15.7 300 110 55 11 11.5 24 16.2 5.1 37.5 3.35 7.2 7.4 10.7 95 60 13 12 32.5 19.0 9.6 4.7 13.0 4.4 6.2 30.5 16.4 150 75 10 13 10.2 12.6 6.9 7.1 7.7 22.5 5.6 19.9 33 30 22 9.0 14 21 24 6.7 5.4 6.5 72 4.9 7.7 63 60 14 28 15 19.9 133 15.3 4.4 6.0 27 4.5 6.2 86 30 11 19 16 12.6 38 9.0 4.0 5.4 8.2 4.4 5.8 92 28 8.5 21 17 16.9 22 6.9 3.7 4.9 5.8 19.5 6.0 177 19 7.5 13 18 10.1 18.4 6.2 4.2 4.7 4.9 10.9 5.6 247 13 7.0 20 19 8.0 11.2 6.6 4.8 4.4 4.2 5.6 4.4 149 10 22 30 20 36.5 10.3 5.4 3.7 4.2 3.85 20.5 4.2 45 9.0 80 15 21 46 8.8 4.9 3.5 66 3.7 12.4 3.85 27 8.0 220 10.9 22 30 7.4 5.7 4.0 67 3.85 6.0 3.7 17.6 7.5 36 8.2 23 18.3 23 20 5.5 55 62 5.4 3.5 25.5 7.5 55 6.9 24 29 9.8 7.2 23 39 53 85 3.25 14.5 6.5 45 6.0 25 21 15.9 9.4 19.6 37.5 50 11.1 3.15 9.1 8.5 20 5.6 26 14.1 23.5 5.8 5.8 10.0 97 203 3.00 7.7 7.0 70 4.9 27 15.0 19.5 5.4 4.7 7.7 32 187 2.85 6.9 34 18 15.8 28 9.9 25 4.9 4.7 6.9 26.5 244 2.75 6.5 19 15 11.8 29 21.5 14.0 9.7 8.4 9.2 241 40 5.8 7.5 50 6.2 30 18.1 11.6 5.7 9.9 6.0 311 34.5 5.6 7.0 33 5.8 31 253 8.5 9.3 30.5 15.0 5.1 20

Million gallons a day Second- Total run-off Month feet (mean) Million Acj'e-feet Maximum Minimum Mean gallons Jul 253 7.4 33.3 51.5 1,030 3,170 Aug 321 7.4 38.2 59.1 1,180 3,630 Sep 23.5 4.9 10.0 15.5 301 923 Oct 23 3.5 8.98 13*9 278 855 HOT 95 4.2 23.4 36^2 702 2,150 Dec 311 3.35 35.8 55.4 1,110 3,400 C alendar year 193 321 2.85 28.8 44.6 10,520 32,290 Jan 244 4.4 34.8 53.8 1,080 3,310 Fob 31.5 2.75 8.01 12.4 224 688 liar 247 2 . 75 42 . 5 65.8 1,320 4,050 Apr 830 5.1 96.0 149 2,880 8,840 May 220 7.0 40.2 62.2 1,250 3,820 Jun 180 4.9 21.2 32.8 635 1,950 Placal year 1937- 830 2.75 32.8 50.7 11,990 36,790 78 ISLAND OF MA.UI

East Wailuaiki Stream near Keanae

Location.- Lat. 20°49'05", long. 156°08'25", 1,000 feet upstream from Koolau ditch crossing and trail and 3 miles southeast of Keanae post office. Drainage area.- 3.7 square miles. Records available.- December 1913 to October 1917 and July 1922 to June 1938. Average discharge.- 16 years (1922-38), 20.5 million gallons a day (31.7 second-feet). Extremes.- Maximum discharge during year, 3,060 million gallons a day (4,730 second-feet) Apr. 6 (gage height, 9.26 feet), from rating curve extended above 300 million gallons a day; minimum, 2.9 million gallons a day (4.5 second-feet) Feb. 28. 1913-17, 1922-38: Maximum discharge, that of Apr. 6, 1938; minimum, 1.0 million gallons a day (1.6 second-feet) Oct. 22, 23, 1917, Aug. 1, 2, 1922. Flood of Dec. 24, 1921, may have reached a higher stage than 9.26 feet, the maxi­ mum given, but owing to destruction of station no data are available for this peak. Remarks.- Records good. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 193V-38 (gage height, In feet, and discharge, In million gallons a day) S'.B 1.4 12.6 2.8 75 4.5 310 4.3 1.6 16.9 3.2 112 5.0 425 1.0 6.3 2.0 "28.5 3.6 159 5.5 570 1.2 9.1 2.4 4V 4.0 215 6.0 760 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 16.2 254 8.6 21.5 26.5 5.1 12.6 9.6 3.0 5.5 19.2 26 2 IV. 2 116 10.7 18.5 11.2 4.8 11.3 V.9 3.2 10.6 58 29.5 3 33.5 66 16.0 21.5 5.4 4.5 10.3 9.1 7.6 19.3 28 12.6 4 66 22 25.5 15.0 6.1 4.3 7.2 V.O 11.2 5.8 16.0 10.1 5 63 15.8 12.6 IV. 6 14.2 4.2 10.0 31.5 14.8 4.8 9.1 9.0 6 113 12.2 10.8 V.9 9.9 4.1 6.4 10.1 5.5 546 V.9 8.0 7 58 10.5 23 11.6 34.5 3.8 25.5 6.8 3.9 827 V.6 15.6 8 IV. 6 14.8 26 13.4 88 3.7 25 6.0 153 298 9.0 30 9 10.0 36.5 11.5 6.4 59 3.5 36 5.5 58 304 86 181 10 V.8 69 9.4 6.1 32 3.4 8.4 5.1 16.3 294 112 53 11 10.9 29.5 19.2 5.8 45 3.2 6.7 6.1 10.4 97 60 13.6 12 36 20.5 10.8 5.2 12.4 3.9 6.0 22.5 17.6 151 75 10.1 13 10.0 13.6 8.2 7.5 7.9 36.5 5.2 15.5 37.5 29.5 22.5 9.3 14 21.5 28.5 V.8 5.8 6.6 84 4.8 6.6 66 62 13.6 28.5 15 18.0 144 IV. 3 5.1 6.0 28 4.6 5.3 88 32 11.2 18.7 16 12.2 38.5 10.5 4.7 5.3 V.9 4.4 4.9 98 28 9.1 21 17 18.7 24.5 7.6 4.5 4.9 5.2 23 5.0 184 12.6'18.7 7.8 12.6 18 10.5 21.5 6.8 5.0 4.6 4.6 10.2 5.0 242 7.5 19.6 19 8.2 13.6 7.2 5.1 4.4 4.1 5.1 4.2 169 10.5 21.5 30.5 20 39.5 11.7 6.1 4.3 4.1 3.8 12.1 4.1 51 9.1 82 15.0 21 57 10.8 5.8 4.1 84 3.6 7.6 3.9 32.5 8.4 219 14.8 22 29.5 9.3 6.6 4.3 77 3*9 4.8 3.7 19.9 7.9 36 10.5 23 17.3 30 22 5.6 66 83 4.6 3.7 29 8.0 55 8.5 24 30 11.2 7.8 35.5 41 48 82 3.5 15.2 7.1 44 7.6 25 21 15.6 8.9 21 38 57 21.5 3.4 9.6 9.0 21 7.2 26 14.9 23.5 6.1 6.0 9.6 89 220 3.2 7.9 7.5 71 6.8 27 13.6 16.9 5.5 4.8 7.5 32 185 3.2 7.1 33.5 18.1 24.5 28 10.5 25.5 5.2 4.8 6.3 29.5 188 3.1 6.4 19.3 14.6 16.4 29 25 14.6 11.6 10.2 9.0 254 38 6.0 7.8 52 7.8 30 IB. 7 12.2 6.4 10.0 5.8 298 44 5.6 7.3 33 7.0 31 209 10.0 9.8 42 16.1 5.2 21

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 209 7.8 33.4 51.7 1,030 3,170 Augi 254 9.3 36.8 56.9 1,140 3,510 Sep 26 5.2 11.4 IV. 6 342 1,050 Oct 35.5 4.1 9.95 15.4 309 947 HOT 88 4.1 24.4 37.8 732 2,250 Dec 298 3.2 37.5 58.0 1,160 3,570 C alendar year 193 314 3.2 31.0 48.0 11,320 34,790 Jan 220 4.4 33.8 52.3 1,050 3,210 Peb 31.5 3.1 7.34 11.4 206 631 Mar 242 3.0 44.7 69.2 1,380 4,250 Apr 827 4.8 96.0 149 2,880 8,840 May 219 7.5 40.2 62.2 1,250 3,830 Jun 181 6.8 22.2 34.4 665 2,040 Flacal year- 1937- 827 3.0 33.3 51.5 12,140 37,300 ISLAND OF MA.UI 79

West Wallualki Stream near Keanae

Location.- Lat. 20°49'20", long. 156°08'35", 500 feet upstream from Koolau ditch cross- Ing and trail bridge and 21 miles south of Keanae post office. Drainage area.- 3.6 square miles. Records available.- January 1914 to October 1917, November 1921 to June 1938. Average discharge.- 16 years (1922-38), 26.2 million gallons a day (40.5 second-feiet). Extremes.- Maximum discharge during year, 3,180 million gallons a day (4,920 second-feet) Apr. 6 (gage height, 11.60 feet], from rating curve extended above 420 million gallons a day; minimum, 2.4 million gallons a day (3.7 second-feet) Feb. 28, Mar. 1. 1914-17, 1921-38: Maximum discharge, 4,500 million gallons a day (6,960 second- feet), estimated, Jan. 14, 1923 (gage height, about 13.5 feet, from floodmarks), from rating curve extended above 420 million gallons a day; minimum, 0.3 million gallons a day (0.5 second-foot) July 26, 1922. Remarks.- Records good except those for periods of missing gage heights, Nov. 16 to Dec. 15, Spr. 13 to June 30 (computed on basis of records for nearby stations), and those above 600 million gallons a day, which are poor. No diversions. Water used for irri­ gation In central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.5 1.95 2.0 40 6.0 835 .7 3.5 2.5 73 7.0 1,190 1.0 7.2 3.0 121 S.O 1,580 1.3 13.0 4.0 270 1.6 22 5.0 510 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 1 16.5 344 S.7 23 £9.5 5.8 15.6 10.8 2.45 5.3 25 27 2 27 133 10.7 21 11.8 5.3 12.2 8.6 2.6 11.5 70 32 3 39.5 88 16.5 24.5 6,3 4.9 11.0 *10.3 6.1 20.5 $5 15 4 78 26.5 30 18.6 6.3 4.6 7.9 7.7 12.0 6.4 20 5 85 16.8 13.8 22.5 15.3 4.4 10.7 41 13.8 5.3 10 ?.. 6 138 12.3 11.0 9.5 11.6 4.3 6.9 11.0 5.8 825 8.0 8.0 7 73 10.2 24 12.6 47 4.2 34.5 7.4 3.7 1,210 7.8 15 8 24 11.3 32.5 12.6 112 4.1 43 6.2 205 »312 9.5 40 9 12.0 39 12.6 6.9 76 3.9 46 5.6 70 *475 100 220 10 8.6 76 9.8 6^3 36.5 3.8 10.0 5.0 17.7 »479 130 60 11 11.4 36 19.4 5.6 55 3.7 7.5 5.3 13.0 »161 70 15 12 44 22.5 11.5 5.1 15.4 6.0 6.3 19.2 18.5 »187 90 11 13 11.6 14.3 8.6 6.8 9.7 40 5.6 12.3 45 40 30 9.5 14 22.5 29 7.7 5.1 7.7 100 5.0 6.4 82 70 15 35 15 20 202 19.7 4.5 «6.8 35 4.7 5.1 113 35 12 20 16 13.4 48 12.0 4.2 6.0 »10 4.4 4.6 126 30 10 23 17 18.9 27.5 7.9 4.0 5.4 6.6 27 4.6 243 23 8.0 13 18 11.4 24.5 6.8 5.8 5.0 5.5 11.0 4.5 366 15 7.6 20 19 8.7 14.0 6.8 4.5 4.8 4.7 5.6 3.8 230 12 25 35 20 48 12.5 5.6 3.8 4.5 4.2 6.9 3.6 66 10 100 17 21 58 12.0 5.1 3.5 95 3.9 5.4 3.3 36.5 9.0 300 16 22 34.5 8.9 6.2 3.9 90 4.1 4.4 3.25 22.5 8.3 50 11 23 21.5 34 23.5 4.7 75 102 4.2 2.95 33.5 8.0 60 9.0 24 39 12.4 8.6 44 45 78 103 2.85 19.0 7.8 50 8.0 25 25 17.6 9.1 18.6 42 55 26 2.8 11.5 9.5 25 7.2 26 16.0 25 6.0 6.3 13.0 108 316 2.7 9.3 8.0 80 6.8 27 15.6 23 5.3 4.9 9.0 38.5 223 2.55 8.0 40 20 30 28 12.2 30 5.0 4.6 7.5 37 225 2.45 7.0 20 15 18 29 25 15.9 13.4 10.1 10.0 344 46 6.3 8.0 60 9.0 SO 19.6 13.8 7.5 10.5 7.0 419 48 5.6 7.5 35 7.0 31 303 10.6 10.3 47 17.9 5.2 22

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Ml&lmun Mean .gallons Acre-feet Jul 303 8.6 41.3 63.9 1,280 3,930 Au£Li:::::::::::::::::::::::::: 344 8.9 44.9 69.5 1,390 4,270 8ep 32.5 5.0 12.2 18.9 365 1,120 Oct 44 3.5 10.6 16,4 328 1,010 NOT 112 4.5 28.9 44.7 866 2,660 Dec 419 3.7 48.3 74.7 1,500 4,600 0 alendar year 193 419 3.2 36.1. 56.9 13,190 40,450 Jan 316 4.2 42.0 65.0 1,300 3,990 Pel) 41 2.45 7.36 11.4 206 632 Mar 366 2.45 68.3 90.2 1,810 5,640 Apr 1,210 5.3 135 209 4,060 12,460 May 300 7.6 48.4 74.9 1,500 4,600 Jun 220 6.8 25.3 39.1 768 2,330 Placal year 1957- 1,210 2.45 42.1 66.1 15,360 47,140

Partly estimated. 80 ISLAND OF MAUI

East Wailuanui Stream near Keanae

Location.- Lat. 20°49'25", long. 156°08'40", 125 feet upstream from Koolau ditch intake, 250 feet upstream from trail, and 24 miles south of Keanae post office. Drainage area.- 0.6 square mile. Records available.- November 1921 to June 1938. January 1914 to October 1917, at site 500 feet upstream. Average discharge.- 16 years (1922-38), 5.90 million gallons a day (9.13 second-feet). Extremes.- Maximum discharge during year, 590 million gallons a day (913 second-feet) Apr. 6 (gage height, 5.45 feet), from rating curve extended above 50 million gallons a day; minimum, 0.98 million gallons a day (1.52 second-feet) Feb. 27 to Mar. 3. 1914-17, 1921-38: Maximum discharge, 1,050 million gallons a day (1,620 second- feet) Feb. 12, 1925 (gage height, 6.96 feet), from rating curve extended above 100 million gallons a day; minimum, 0.1 million gallons a day (0.2 second-foot) Apr. 11, 1926. Remarks.- Records good. No diversions. Water used for irrigation in central Maul.

kating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.3 0.40 0.7 6.3 1.6 52 .4 1.15 1.0 17.0 2.0 83 .5 2.5 1.3 33 2.5 132 Discharge, in million gallons, fiscal year July 1937 to June 193S

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 4.3 41 2.7 6.0 8.6 2.15 2.0 3.25 0.98 1.75 7.8 10.1 2 4.5 41 3.1 7.2 4.5 2.0 3.95 2.9 .98 4.9 20 14.8 3 7.5 19.0 4.9 7.5 2.7 2.0 4.2 2.8 3.3 4.5 11.4 4.6 4 13.0 7.3 5.2 7.2 2.9 1.88 2.9 2.15 8.4 1.88 7.7 3.45 5 12.8 5.0 3.65 5.7 6.3 1.75 3.2 6.4 5.1 1.62 3.45 3.05 6 24 4.0 3.25 2.9 3.25 1.75 2.3 2.5 1.S8 99 2.9 2.5 7 8.0 3.45 7.6 5.2 5.5 1.62 4.1 2.15 1.49 122 2.7 5.1 8 4.2 6.6 6.4 7.0 11.3 1.49 6.8 2.0 35.5 27.5 3.8 8.4 9 3.25 9.1 3.45 2.3'2.7 5.4 1.37 6.3 1.88 9.0 40 28 44 10 2.7 27 2.9 5.8 1.37 2.5 1.75 5.3 61 26.5 18.9 11 3.85 S.2 7.9 2.15 18.2 1.49 2.15 2.15 3.25 18.5 15.2 4.0 12 6.5 7.3 3.75 1.88 4.0 1.62 2.0 9.4 7.3 30.5 14.1 3.25 13 2.9 4.8 2.9 2.95 2.9 11. S 1.S8 4.7 13.2 6.0 4.6 2.9 14 7.0 13.4 2.7 2.15 2.5 23 1.75 2.7 10.8 28 3.45 9.4 15 5.4 33 6.4 1.8S 2.3 9.1 1.62 2.15 8.9 8.3 3J05 5.4 16 4.4 9.2 3.5 1.75 2.0 3.4 1.49 2.0 17.0 4.4 2.5 8.0 17 11.1 9.6 2.3 1.62 1.88 2.15 7.8 2.15 38 4.0 2.3 4.7 18 4.8 8.4 2.15 2.1 1.75 1.75 2.95 2.15 40 3.05 2.15 8.0 19 3.65 4.4 2.5 1.75 1.62 1.62 1.75 1.75 24.5 2.5 8.7 12.5 20 7.9 3.85 2.0 1.49 1.62 1.49 2.4 1.62 8.6 2.3 24 4.5 21 23. B 3.25 1.88 1.37 14.0 1.37 2.15 1.49 9.0 2.3 48 4.3 22 8.6 2.9 2.0 1.37 14.5 1.49 1.62 1.37 8.4 2.15 7.3 3.05 23 5.4 8.8 5.6 1.75 17.5 22.5 1.37 1.26 10.6 2.15 20 2.7 24 9.0 3.25 2.15 14.9 19.5 10.8 9.6 1.26 5.2 1.75 13.8 2.3 26 9.2 4.2 2.8 5.4 14.8 10.0 4.2 1.26 3.45 2.6 9.0 2.15 26 6.6 4.3 1.88 2.3 3.85 17.1 33.5 1.15 2.9 2.0 27 2.0 27 5.2 3.65 1.75 1.88 3.05 6.8 37 1.06 2.5 9.5 6.1 9.0 28 3.65 6.5 1.62 2.0 2.9 14.3 35.5 .98 2.15 3.4 5.4 5.3 29 10.8 4.2 3.2 5.0 4.1 73 6.9 1.88 2.0 20 2.3 30 7.6 4.0 1.88 3.45 2.5 55 17.0 1.75 2.0 9.4 2.15 31 27 2.9 4.7 11.3 5.0 1.62 7.8

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 27 2.7 8.33 12.9 258 793 Augi 41 2.9 10.1 15.6 314 962 Sep 7.9 1.62 3.47 5.37 104 319 Oct 14.9 1.37 3.79 5.86 118 361 Nov 19.5 1.62 6.39 9.89 192 588 Dec 73 1.37 9.63 14.9 298 916 0 alendar year 19. 73 1.37 8.32 12.9 3,040 9,320 Jan 3V 1.37 7.03 10.9 218 669 Feb 9.4 .98 2.44 3.78 68.4 210 Mar 40 .98 9.45 14.6 293 899 Apr 122 1.62 16.7 26.8 502 1,540 May 48 2.16 11.9 18.4 368 1,130 Jun 44 2.0 7.09 11.0 213 663 FLscal year 1937-558 ...... 122 .98 8.07 12.5 2,960 9,040 ISLAND OF MAUI 81

West Walluanui Stream near Keanae Location.- Concrete spillway and overflow dam, lat. 20 049'40", long. 156 008'55n , 150 reet upstream from Koolau ditch crossing and Intake and 2i miles south of Keanae post office. Drainage area.- 0.7 square mile. Records available.- December 1913 to October 1917 and July 1922 to June 1938. Average aiscnargeT- 16 years (1922-38), 9.64 million gallons a day (14.9 second-feet). Extremes.- Maximum discharge recorded during year, 430 million gallons a day (665 second- leetj Dec. 30 (gage height, 6.39 feet), from rating curve extended above 18 million gallons a day by broad-crested weir and orifice formulas; minimum discharge, 0.35 million gallons a day (0.54 second-foot) Oct. 22. 1913-17, 1922-38: Maximum discharge, 1,220 million gallons a day (1,890 second- feet) Jan. 14, 1923 (gage height, 7.70 feet), from rating curve extended above 82 million gallons a day; minimum, 0.2 million gallons a day (0.3 second-foot) July 16-21, 1922. Remarks.- Records fair except those for periods of missing gage heights, Mar. 13-20, Mar. 27 to June 30, which were computed on basis of records for stations on all nearby streams and are poor. No diversions. Water used for irrigation of sugarcane In central Maul.

Rating tables, fiscal year 1937-38 ge height, in feet, and discharge, In million gallons a day) With gate open With gate closed 1.67 0.0 2.4. 21.5 2.4 0.00 3.3 45 1.7 .6 2.7 33.5 2.5 1.75 3.6 69 1.8 2.9 3.0 47 2.6 4.6 4.0 107 1.9 5.4 3.5 79 2.8 12.5 4.5 161 2.0 8.1 4.0 123 3.0 23 5.0 225 2.8 14.3 4.5 186 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 1 4.2 100 4.0 7.0 8.2 3.75 16.3 5.7 2.05 3.5 13 15 2 6.6 47 4.3 8.6 3.9 3.45 12.1 4.6 2.6 8.0 30 18 3 9.5 30.5 6.2 8.8 1.58 3.2 10.0 5.0 4.9 10 17 9 0 4 18.8 13.0 7.9 8.4 1.58 3.2 5.0 4.3 10.5 4.0 9. 0 70 5 24 8.4 5.3 7.1 5.6 2.6 5.3 17.6 5.6 3.0 7. 0 56 6 37 6.8 4.6 3.75 2.06 2.6 4.0 5.3 2.6 120 5. 6 50 7 24 6.1 9.2 6.1 10.9 2.3 12.3 4.0 1.75 150 5. 0 70 8 10.8 8.0 9.6 6.7 45 2.3 6.7 3.45 69 50 6. 0 20 9 6.1 13.0 5.3 2.6 26.5 2.05 32.5 3.45 20 60 35 60 10 4.3 25.5 4.6 2.3 18.4 8.05 6.4 4.0 7.9 70 40 30 11 5.3 IS. 3 9.4 8.05 22 2.05 5.3 5.3 4.6 40 25 8.0 12 9.8 9.6 5.7 1.58 7.9 2.05 4.6 12.6 9.8 50 30 6.0 13 4.6 6.9 4.3 3.45 5.3 11.5 4.0 5.2 20 15 14 5.4 14 8.1 IS.S 3.2 2.6 5.0 29 4.0 3.45 16 40 10 17 15 7.2 59 9.3 2.05 4.3 12.3 4.0 3.2 14 28 8. 0 12 16 5.7 16.4 6.1 1.58 3.75 4.9 3.2 3.2 30 16 7. O 15 17 11.4 IS. 9 4.3 1.40 3.45 3.75 11.6 3.75 60 12 6. 0 9.0 18 8.3 IS. 4 4.3 1.69 3.45 3.2 5.5 4.6 70 9.0 5. 6| 14 19 2.45 7.6 5.0 .88 3.2 2 9 3.45 3.75 50 8.0 10 18 20 7.3 6.4 3.2 .52 3.2 2 9 3.8 3.75 25 7.0 40 10 21 18.6 5.7 2.9 .35 23.5 2.9 3.45 3.45 17 6.6 70 7.0 ZZ 6.4 5.0 2.9 .35 25.5 3.2 2.9 3.45 12 6.0 20 5.4 Z3 2.55 10.8 7.6 .88 30 26 2.6 4.0 16.6 5.6 30 4.5 24 7.4 6.0 3.2 11.7 19.0 25 28.5 3.2 10 5.6 25 4.0 25 7.1 6.1 4.0 6.6 17.8 22.5 9.4 2.9 6.8 6.2 14 3.3 26 2.8 6.4 2.3 1.22 6.8 31 83 2.6 5.7 5.0 11 3.5 Z7 1.85 6.4 2.05 1.05 5.7 14.2 79 2.05 5.0 15 9. 0 12 ZB 4.2 9.1 1.75 1.05 4.6 18.3 71 1.75 4.6 8.0 8. 0 8.0 29 8.8 6.9 3.7 .3.65 5.6 97 21.5 4.0 5.0 30 4.5 30 3.5 6.1 2.3 2.6 4.0 172 28 4.0 4.5 20 4.0 31 94 4.3 3.25 39 8.7 3.5 13

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Here-feet Jul 94 1.85 12.0 18.6 373 1,140 Aug 100 4.3 15.7 24.3 486 1,490 Sep 9.6 1.75 4.95 7.66 148 456 Oet 11.7 .35 3.61 6.59 112 343 NOT 45 1.58 10.9 16.9 328 1,010 Dec 172 2.05 17.8 27.5 553 1,700 C alendar year 192 172 .35 13.4 20.7 4,880 14,990 Jan 83 2.6 16.1 24.9 498 1,630 Feb 17.6 1.75 4.63 7.16 130 398 Mar 70 1.75 16.6 25.7 515 1,580 Apr 160 3.0 25.7 39.8 771 2,370 May 70 5.0 18.5 28.6 573 1,760 Jun 60 3.5 11.6 17.9 348 1,070 Placal year 1937- 38 172 .35 13.2 20.4 4,840 14,850 82 ISLAND OF MA.UI

Taro patch feeder ditch at Keanae

Location.- Parshall flume, lat. 20°51'40n , long. 156°09'00", 100 feet southeast of highway bridge over Piinaaua Stream at Keanae, 4i miles northwest of Nahiku, and 4f miles southeast of Kailua. Records available.- September 1934 to June 1938. Extremes.- Maximum discharge during year, 11.6 million gallons a day (17.9 second-feet) Apr. 6 fgage height, 2.04 feet), from rating curve extended above 3.2 million gallons a day by Parshall flume formula; minimum, 0.05 million gallons a day (0.08 second-foot) Apr. 7, 8. 1934-38: Maximum discharge, 19.4 million gallons a day (30.0 second-feet) Feb. 25, 1935 (gage height, 2.86 feet), from rating curve computed from 3.2 to 18.0 million gallons a day by Parshall flume formula and extended abovej minimum, 0.05 million gallons a day (0.08 second-foot) Feb. 28, 1935 and Apr. 7, 8, 1938. Remarks.- Records excellent. Water used in vicinity of Keanae for irrigation of taro.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. Hay June

1 2.55 3.65 2.75 2.75 2.6 2.35 2.0 2.0 2.6 2.6 2.3 2.45 2 2.55 3.5 2.7 2.8 2.45 2.3 1.63 1.96 2.6 2.6 2.65 2.5 3 2.75 3.15 2.75 2.8 2.35 2.3 1.67 1.96 2.6 2.75 2.5 2.35 4 2.9 2.85 2.85 2.8 2.3 2.3 2.0 1.91 2.9 2.6 2.4 2.3 5 2.9 2.8 2.7 2.8 2.5 2.2 2.6 2.25 2.7 2.55 2.35 2.25 6 3.15 2.75 2.65 2.65 2.35 2.15 2.6 1.96 2.5 4.0 2.35 2.25 7 2.75 2.7 2.75 2.7 2.4 2.15 2.65 1.91 2.45 .95 2.3 2.25 8 2.6 2.75 2.8 2.75 2.75 2.15 2.6 1.87 3.2 1.41 2.3 2.4 9 2.6 2.9 2.7 2.6 2.55 2.15 2.65 1.87 3.0 3.0 2.85 3.35 10 2.6 3.25 2.65 2.6 2.5 2.15 2.3 1.87 2.6 1.92 3.25 2.55 11 2.6 2.9 2.85 2.6 2.85 2.15 2.25 1.91 2.55 .33 2,85 2.15 12 2.8 2.75 2.75 2.6 2.45 2.1 2.2 2.0 2.6 1.32 2.85 2.1 13 2.5 2.7 2.7 2.6 2.35 3.6 2.15 2.0 2.95 2.15 2.6 2.1 14 2.7 2.85 2.7 2.55 2.35 3.0 2.1 1.87 2.95 2.85 2.55 2.15 15 2.55 3.15 2.8 2.5 2 3 2.7 2.1 1.82 3.0 2.7 2.55 2.15 16 2.6 2.5 2.75 2.4 2.3 2.5 2.15 1.77 3.25 2.5 2.5 2.1 17 2.75 2.4 2.7 2.35 2.3 2.4 2.35 2.05 3.7 2.5 2.5 2.05 18 2.55 2.45 2.7 2.35 2.35 2.35 2.3 2.85 3.9 2.3 2.45 2.35 19 2.55 2.3 2.65 2.35 2.3 2.3 2.25 2.75 3.6 2.25 2.6 2.65 20 2.8 2.65 2.65 2.3 2.2 2.25 2.45 2.65 3.0 2.25 3,1 2.5 21 3.1 2.8 2.65 2.25 2 9 2.25 2.45 2.65 2.85 2.25 3.6 2.55 22 2.85 2.8 2.65 2.25 stis 2.2 2.4 2.6 2.75 2.25 2.5 2.5 23 2.65 3.0 2.85 2.2 3.2 2.95 2.35 2.6 2.9 2.2 2.65 2.45 24 2.8 2.8 2.75 2.5 2.95 2.85 2.9 2.55 2.8 2.2 2.7 2.4 25 2.75 2.75 2.75 2.65 2.8 2.8 2.55 2.55 2.8 2.15 2.45 2.4 26 2.7 2.8 2.75 2.4 2.6 3.0 3.6 2.6 2.8 2.2 2.9 2.4 S7 2.7 2.75 2.7 2.35 2.5 2.8 3.65 2.6 2.75 2.45 2.4 2.5 28 2.7 2.85 2.65 2.3 2.45 2.75 3.2 2.6 2.7 2.35 2.35 2.45 29 2.8 2.75 2.75 2.35 2.4 3.9 2.3 2.65 2.3 2.65 2.35 30 2.75 2.75 2.65 2.45 2.35 3.6 2.45 2.65 2.3 2.55 2.35 31 3.4 2.75 2.35 2.6 2.2 2.65 2.35

Kill Ion gallons a day Second- Total run-off Month feet (mean) Hllllon Maxdj&um Klnimum He an gallons Acre -feet Jul 3.4 2.5 2.74 4.24 85.0 261 Auff 3.65 2.3 4.38 87.8 269 Sep 2.85 2.65 2.72 4.21 81.7 251 Oct 2.8 2.2 2.51 3.88 77.9 239 HOT 3.2 2.2 2.53 3.91 75.8 233 Dec 3.9 2.1 2.56 3.96 79.2 243 C alendar year 193 3.9 .17 2.61 4.04 951 2,920 Jan 3.65 1.63 2.42 3.74 75.0 230 Feb 2.85 1.77 2.21 3.42 62.0 190 Mar 3.9 2.45 2.87 4.44 89.0 273 Apr 4.0 .33 2.27 3.51 68.2 209 Hay 3.6 2.3 2.61 4.04 80.9 248 Jim 3.35 2.05 2.38 3.68 71.3 219 F Iscal year 1937- 4.0 .33 2.56 3.96 934 2,860 ISLAM) OF MAUI 83

Koolau ditch near Keanae

Location.- Lat. 20°49'55", long. 156°10'30", on west side of Keanae Valley, 2$ miles southwest of Keanae post office and 5.1 miles southeast of Kailua. RecordsI938~: available.- January 1910 to December 1912 (staff gage), November 1917 to June

Average discharge.- 20 years (1918-38), 65.8 million gallons a day (102 second-feet). Extremes.- Maximum discharge during year, 165 million gallons a day (255 second-fest) Dec. 30 (gage height, 5.78 feet); minimum, 1.6 million gallons a day (2.5 seconi-feet) Dec. 31. 1910-12, 1917-38: Maximum discharge, 175 million gallons a day (271 second-feet) Jan. 4, 1922 (gage height, 6.36 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records good except those for period of missing gage heights, Apr. 3-30,which were computed on basis of records for Koolau ditch at Haipuaena and are fair. Plow regulated by gates and spillways. Ditch diverts water at altitude 1,200 feet from nearly all streams from the Makapipi west to the Alo for power and irrigation in central Maul. No diversions above station except from several spillways.

Dlscliarge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. Hay June

1 72 157 79 98 122 57 75 97 34.5 68 128 140 2 115 157 94 129 90 53 108 87 34.5 97 141 140 3 137 153 97 133 57 49 108 96 64 125 140 116 4 144 141 133 118 64 47 83 76 115 65 128 92 5 144 137 104 118 112 45 97 125 115 56 92 89 6 148 122 94 76 90 45 68 90 55 130 77 77 7 144 111 122 94 108 43 129 72 41 135 70 108 8 133 118 133 104 144 41 101 68 100 112 75 140 9 104 144 104 68 141 39.5 133 64 137 118 132 134 10 83 148 83 59 138 38 83 62 129 112 138 140 11 94 141 118 55 144 38 72 90 97 90 140 124 12 137 137 104 51 111 39.5 64 94 115 129 140 104 13 97 125 76 76 83 76 57 115 148 79 140 89 14 111 141 72 59 68 144 55 83 153 101 104 140 15 125 148 115 51 59 130 51 68 153 101 100 132 16 111 144 90 47 53 87 49 62 153 101 77 140 17 133 141 68 43 49 59 97 64 157 139 66 124 18 111 141 64 52 47 50 87 62 153 118 62 135 19 87 125 68 47 45 45 55 51 148 101 92 140 20 133 118 55 41 43 43 70 47 148 90 141 116 21 144 108 53 39.5 106 41 83 45 148 81 134 112 22 141 90 59 41 144 43 53 43 141 78 120 85 23 137 90 113 53 144 130 45 41 144 78 141 74 24 141 101 72 101 141 144 121 39.5 133 69 140 66 25 137 122 87 110 144 141 122 38 108 79 124 59 26 133 125 55 59 111 137 144 36 97 64 138 56 27 133 133 51 49 90 144 144 34.5 87 129 128 116 28 111 137 47 49 76 133 144 34.5 79 107 120 116 29 129 122 77 68 90 187 141 76 70 141 62 30 137 111 55 79 64 75 141 68 66 132 59 31 141 90 75 1.9 129 64 140

Hill Ion gallons a day Second- Total run-off Month feat (mean) Hllllon Haxlxnm Minimum He an gallons Acre-feet Jul 148 72 124 192 3,850 11,810 Aug 157 90 128 198 3,980 12.210 Sep 133 47 84.7 131 2.540 7.8OO Oct 133 39.5 72.3 112 2,240 6,880 NOT 144 43 95.9 148 2,880 8,830 Dec 157 1.9 74.7 116 2,320 7,110 0 alendar year 19! 157 1.9 105 162 38,340 117,600 Jan 144 46 93.8 145 2,910 8,930 Fob 125 34.5 67.3 104 1,880 5,780 Mar 157 34.5 110 170 3,400 10,420 Apr 139 56 96.3 149 2,890 8,860 Hay 141 62 117 181 3,640 11,170 Jun 140 56 107 166 3,220 9,890 FIscal year 1937-,*Q 167 1.9 97.9 161 35,760 109,700 ISLAND OF MAUI

Honomanu Stream near Keanae

Location.- Lat. 20°50'10", long. 156°11'20", 500 feet upstream from Spreckels ditch intake and trail bridge and 3 miles by trail northwest of Keanae. Drainage area.- 3.3 square miles. Records available.- November 1913 to June 1938. Average discharge.- 22 years (1916-38), 16.0 million gallons a day (24.8 second-feet). Extremes.- Maximum discharge during year, 1,460 million gallons a day (2,260 second- reetj Apr. 7 (gage height, 8.64 feet), from rating curve extended above 460 million gallons a day; minimum, 0.70 million gallons a day (1.08 second-feet) Mar. 1. 1913-38: Maximum discharge, 1,580 million gallons a day (2,440 second-feet) Feb. 25, 1935 (gage height, 8.98 feet), from rating curve extended above 460 million gallons a day; minimum, 0.08 million gallons a day (0.12 second-foot) Mar. 24, 1928. Remarks.- Records good. No diversions. Water used for irrigation in central Ilaui.

Rating table, fiscal year 1937-38 ge height, in feet, and discharge, in million gallons a day) 1.6 0.65 2.6 26 4.0 173 1.8 2.15 2.8 37.5 4.5 269 2.0 5.2 3.0 52 5.0 385 2.2 10.0 3.3 80 6.0 650 2.4 16.8 3.6 114

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 18.1 148 4.3 7.4 15.5 2.55 7.4 5.2 0.75 2.1 10.6 11.4 2 15.4 106 6.8 13.2 6.5 2.15 5.0 6.3 .90 8.6 30 14.6 3 25.5 68 12.4 14.5 3,2 2.05 5.3 12.5 2.15 16.8 16.6 7.7 4 44 14.6 23.5 14.4 3.2 1.85 3.45 5.2 16.0 4.0 10.9 5.4 5 36.6 9.2 8.4 17.4 9.1 1.65 4.8 21.5 7.8 2.65 7.4 4.0 6 58 6.5 5.9 4.8 5.4 1.55 3.2 6.4 4.0 324 13.1 3.2 7 27.5 6.6 17.4 6.1 19.1 1.45 22 3.6 1.75 620 9.0 8.5 8 10.6 8.0 20.5 9.7 64 1.25 22 2.8 92 213 8.0 24 9 5.2 26 7.0 4.3 36.5 1.15 22.5 3.2 34.5 249 53 127 10 4.0 47 5.0 3.45 20 1.15 4.5 2.3 15.7 268 83 41 11 7.3 22 15.9 3.05 41 1.10 3.2 2.05 10.2 70 36 10.2 12 23 13.9 8.2 2.8 9.0 1.10 2.65 2.8 13.6 100 49 5.9 13 6.9 9.0 4.7 3.6 4.5 17.9 2.4 3.8 31.5 21 16.4 5.2 14 12.8 20 4.5 3.2 3.45 56 2.15 4.2 47 29.5 9.0 25.5 15 12.2 117 10.5 2.65 2.95 20 2.05 2.4 56 21.5 7.7 13.8 16 7.9 29 7.7 2.4 2.65 5,9 1.95 2.05 75 41 7.0 11.4 17 15.5 16.4 4.2 2.3 2.4 3.8 14.4 2.05 117 20.5 4.5 7.9 18 11.9 12.9 3.3 2.4 2.15 3.45 6.6 2.3 186 12.9 3.45 14.1 19 5.4 7.4 3.3 4.1 2.05 2.4 2.8 1.45 129 8.7 12.1 13.8 20 36 6.5 3.05 2.15 1.85 1.95 2.15 1.25 32.5 5.9 72 6.7 21 27 6.3 2.65 1.85 42 1.65 1.95 1.10 22 4.8 128 5.2 22 19.4 4.3 2.8 1.75 52 1.92 1.85 1.05 13.2 4.3 25 3.6 23 11.2 22.5 13.3 2.15 38.5 49 1.65 .95 19.2 3.8 36 2.95 24 23.5 7.3 4.2 13 ."1 17.1 48 49 .90 10.3 3.05 32.5 2.65 25 13.4 11.5 6.0 10.9 19 9 17.0 15.4 .90 6.3 4.1 16.5 2.4 26 9.4 15.8 12.4 3.05 5.4 40 141 .85 4.7 3.2 59 2.15 27 11.3 15.2 5.7 2.15 3.8 21 120 .80 3.8 23.5 11.9 13.9 28 6.3 15.4 3.05 2.15 3.05 14.7 54 .75 3.05 12.1 9.7 11.8 29 16.4 10.4 10.6 7.3 5.9 158 14.7 2.55 4.5 33.5 4.2 30 11.8 9.7 4.9 9.8 3.05 246 11.6 2.15 3.45 24 2.95 31 139 5.6 6.5 32 9.3 1.95 16.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 139 4.0 21.7 33.6 671 2,060 Augi 148 4.3 26.3 40.7 816 2,500 Sep 23.5 2.65 8.07 12.5 242 743 Oct 17.4 1.V5 5.95 9.21 185 567 HOT 64 1.85 14.8 22.9 445 1,370 Dec 246 1.10 24.5 37.9 760 2,330 C alendar year 19 246 1.10 19.9 30.8 7,270 22,310 Jan 141 1.65 18.1 28.0 561 1,720 Feb 21.5 .75 3.59 5.55 101 309 Mar 186 .75 31.0 48.0 963 2,950 Apr 620 2.1 70.2 109 2,110 6,460 May 128 3.45 27.4 42.4 851 2,610 Jun 12V 2.15 13.8 21.4 413 1,270 Flacal year 1937- 38 620 .75 22.2 34.3 8,120 24,890 ISLAND OF MAUI 85

Haipuaena Stream near Huelo

Location.- Lat. 20 051'05", long. 156°11'30", 200 feet upstream from inflow of t!preckels ditch, 3i miles southeast of Kailua, and 4.7 miles southeast of. Huelo. Drainage area.- 1.1 square miles. Records available.- October 1913 to June 1938. Average discharge.- 22 years (1916-38), 10.5 million gallons a day (16.2 second-feet). Extremes.- Maximum discharge during year, 450 million gallons a day (696 second-feet) Apr. 7 (gage height, 5.40 feet), from rating curve extended above 130 million gallons a day; minimum, 0.20 million gallons a day (0.31 second-foot) Dec. 12, Jan. 22. 1913-38: Maximum discharge, 582 million gallons a day (900 second-feet) Feb. 17, 1929 (gage height, 6.25 feet), from rating curve extended above 130 million gallons a day; minimum, that of Dec. 12, 1937, Jan. 22, 1938. Remarks.- Records good. Discharge for period of missing gage heights, June 28-30, computed on basis of records for Puohokamoa Stream near Huelo. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.0 0.12 0.6 2.35 1.6 22 3.5 175 .1 .24 .8 4.4 1.9 34.5 4.0 242 .2 .44 1.0 7.3 2.2 51 .3 .73 1.2 11.1 2.5 71 .4 1.15 1.4 15.7 3.0 115 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 12.0 92 0.73 1.57 10.0 0.38 3.35 1.65 0.22 0.36 4.3 9.3 2 11.9 71 1.52 6.1 2.7 .34 1.86 2.05 .26 3.0 24.5 13.5 3 20.5 53 4.7 10.0 .47 .32 2.6 7.1 .88 10.6 14.2 4.8 4 32.5 12.4 11.8 9.2 .47 .30 .77 1.60 12.6 .98 7.4 3.05 5 28 8.2 2.8 11.4 4.5 .28 1.09 11.7 4.1 .53 3.8 2.2 6 43 6.5 1.72 1.48 1.57 .26 .44 2.1 1.60 120 5.6 1.72 7 22.5 5.4 9.2 2.8 10.2 .24 9.6 .81 .40 210 3.8 4.6 8 9.6 8.2 10.4 6.1 35 .24 5.7 .55 50 83 3.95 14.9 9 5.4 22.5 2.15 .89 17.3 .23 16.6 .50 24.5 109 32 83 10 4.4 41 1.15 .53 14.2 .23 1.04 .34 6.5 120 53 34 11 6.0 19.2 9.5 .40 32 .22 .42 .42 4.6 36 26.5 6.0 12 18.1 14,0 3.35 .36 4.7 .22 .30 .80 4.4 63 29 3.5 13 5.3 9.5 1.07 1.21 1.45 11.2 .26 .89 24.5 12.8 7.3 2.6 14 10.3 19.9 .70 .78 .70 40 .23 1.34 31.5 23.5 4.1 18.3 15 9.9 71 2.95 .44 .47 14.0 .22 .42 33 17.3 3.3 8.6 16 7.6 25 1.88 .38 .40 2.15 .22 .34 46 29 3.4 8.4 17 16.0 14.5 .56 .34 .36 .70 7.9 .56 78 12.0 1.93 4.8 18 8.0 12.2 .40 .34 .34 .42 2.8 1.54 99 6.3 1.40 9.5 19 5.2 7.3 .47 .38 .32 .30 .30 .44 71 4.2 8.7 8.4 20 24.5 6.2 .40 .34 .30 .28 .23 .34 17.6 2.8 44 3.75 21 30 5.3 .28 .30 27 .24 .22 .30 14.2 2.15 76 2.55 22 18.2 4.2 .28 .28 31 .26 .20 .28 8.6 1.72 15.4 1.86 23 10.9 17.9 8.0 .30 29.5 30.5 .23 .26 11.9 1.65 27.5 1.45 24 22 6.0 .88 6.6 13.5 27 26.5 .24 6.3 1.15 26 1.25 25 15.0 8.9 1.83 9.2 15.0 10.5 6.7 .24 2.9 1.79 8.9 .98 26 10.3 9.3 3.1 .50 2.3 26 80 .60 1.93 1.25 46 .86 27 10.7 5.9 1.34 .36 1.02 11.7 74 .24 1.40 14.7 7.8 *9.8 28 6.5 6.2 .32 .36 .56 8.3 35.5 .22 1.02 6.6 6.3 8.8 29 17.2 4.1 2.25 1.35 1.82 83 6.6 .70 1.72 26.5 1.5 30 12.2 3.8 .96 5.6 .47 99 5.5 .50 1.40 19.1 1.0 .31 82 1.45 .90 16.7 4.8 .38 11.1

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 82 4.4 17.3 26.8 536 1,640 Aug 92 1.45 19.1 29.6 592 1,820 Sep 11.8 .28 2.89 4.47 86.7 266 Oct 11.4 .28 2.61 4.04 80.8 248 HOT 35 .30 8.65 13.4 260 797 Dec 99 .22 12.4 19.2 386 1,180 C alendar year 193 107 .22 13.8 21.4 5,030 15,430 Jan 80 .20 9.55 14.8 296 909 Feb 11.7 .22 1.35 2.09 37.8 ire Mar 99 .22 18.1 28.0 560 1,720 Apr 11...... 210 .36 30.0 46.4 898 2,760 May 76 1.40 17.8 27.5 553 1,700 Jun 83 .86 9.17 14.2 275 844 FIscal year 1937- 210 .20 12,5 19.3 4,560 14,000

#Partly estimated. 86 ISLAND OF MAUI

Haipuaena diversion ditch at Kolea Gulch, near Keanae

Location.- Parshall flume, lat. 20°50'50", long. 156°11'4Q", on Haipuaena diversion ditch, 15 feet downstream from end of tunnel in Kolea Gulch, 3.1 miles southwest of Keanae, and 3.7 miles southeast of Kailua. Altitude, about 1,800 feet, from topographic map. Records available.- March to June 1938. Extremes.- Maximum discharge during period, 11.7 million gallons a day (18.1 second- reetj Apr. 7 (gage height, 1.57 feet); minimum, 0.94 million gallons a day (1.45 second-feet) Mar. 1. Remarks.- Records excellent. Haipuaena diversion ditch diverts water from Haipuaena Stream for East Maul Irrigation Co.'s hydroelectric plant about 1 mile downstream.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oot. Nov. Dec. Jan. Feb. Har. Apr. May June

1 #1.05 2.05 2.9 3.1 2 1.22 2.75 4.5 3.35 3 1.68 3.8 3.5 2.6 4 3.75 2.3 2.9 2.3 5 3.05 2.1 2.4 2.1 6 2.4 5.7 2.7 2.05 7 1.78 8.7 2.4 2.5 a 5.0 7.0 2.7 3.7 9 4.6 7.0 4.4 6.9 10 3.5 7.6 5.9 5.0 11 3.2 5.2 4.5 2.8 12 3.6 6.3 4.4 2.35 13 5.2 3.7 2.9 2.2 14 5.8 4.1 2.4 4.1 15 6.0 4.0 2.35 3.05 16 6.2 4.5 2.4 3.1 17 7.0 3.5 2.05 2.7 18 8.2 2.95 1.85 3.3 19 7.0 2.65 2.55 3.2 20 4.8 2.4 5.1 2.5 21 4.5 2.3 6.5 2.3 22 3.8 2.1 3.6 2.2 23 4.3 2.05 4.4 2.1 24 3.5 1.92 4.5 1.98 25 2.95 2.05 3.3 1.98 26 2.7 1.98 5.5 1.92 27 2.6 3.6 2.9 3.25 28 2.35 2.9 2.7 3.1 29 2.3 2.05 4.6 2.2 30 2.2 1.92 3.85 2.05 31 2.05 3.3

Million gallons a 'day Second- Total run-off Hontn feet (mean) Hllllon Haxjjnmn Minimum Mean gallons Acre -feet Jul Aug Sep Oot HOT Dec C alendar year Jan Feb Mar 8.2 1.05 3.82 5.91 118 363 Apr 8.7 1.92 3.71 5.74 111 341 Hay 6.5 1.85 3.55 5.49 110 337 Jun 6.9 1.92 2.87 4.44 86 264 1Tie peri 1,300 fcPartly estimated. ISLAND OF MAUI 87

Spreckels ditch at Haipuaena weir, near Huelo

Location.- Sharp-crested weir, lat. 20°51'20", long. 156°11'25", on Spreckels ditch trail "between Haipuaena and Puohokamoa Streams, 34 miles southeast of Kailua and 5.1 miles southeast of Huelo. Records available.- April 1922 to June 1938. February 1930 to October 1935 at site 100 feet upstream. Average discharge.- 15 years (1922-29, 1930-38), 15.0 million gallons a day (23.2 second- feet;. Extremes.- Maximum discharge during year, 77 million gallons a day (119 second-feet) Apr. 6 (gage height, 2.12 feet); minimum, 0.20 million gallons a day (0.31 second- foot) Dec. 11, 12. 1922-38: Maximum discharge, 139 million gallons a day (215 second-feet) Mar. 5, 1933 (gage height, 5.03 feet); no flow at times,when water was turned out of ditch. Remarks.- Records excellent except those for periods of missing gage heights, Feb. 14 to Mar. 7, Apr. 11-16, which were computed on basis of records for stations on all nearby streams and are poor. Regulated by gates and spillways. Spreckels ditch diverts water from all streams between the Nuaailua and the Kailua, above Koolau ditch east of the Puohokamoa and below Koolau ditch west of the Puohokamoa. About 4 million gallons a day is diverted from Spreckels ditch to East Maul Irrigation Company's hydroelectric plant at Kolea gulch. Water used for irrigation in central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 19.5 67 9.0 12.6 25.5 3.8 15.8 9.2 1.00 2.45 19. S 27.5 2 25.5 71 12.5 22.5 14.2 2.95 12.0 10.0 1.00 12.4 39.5 31.5 3 36 50 IS.O 26 6.O 2.3 14.5 18.5 4.5 22 29 IS. 8 4 4S 27.5 29 26.5 7.2 1.86 7.6 9.0 40 7.1 22 15.2 5 45 21 17.0 25.5 3.9 9 1.40 10.4 24.5 15 4.1 14.8 10.0 6 52 17.1 13.7 10. S 11.4 1.01 6.0 10.2 6.0 36.5 15.5 S.O 7 39 22*12 9 26 15.2 22 .60 24.5 6.5 6.0 23.5 15.5 13.2 8 22.5 25.5 19.7 43 .39 16.9 4.9 35 17.2 14.9 29.5 9 12.3 3S.5 15.1 9.0 30 .25 27 5.1 34 18.0 36.5 61 10 9.2 57 11.4 6.9 26.5 .25 Q g 2.95 21.5 17.2 54 51 11 14.8 34 24.5 5.8 42 .22 6.2 3.55 17.4 17 44 20 12 33.5 29.5 16.6 4.5 18.3 .22 4.5 6.2 21 30 40 15.6 13 12.6 23.5 9.S 11.9 9.9 11.8 3.55 6.6 41 25 22 12.8 14 22 36.5 9.5 8.2 7.1 49 2.7 6.0 47 22 16.2 32.5 15 24.5 59 17.3 4.7 5.4 29 2.1 5.3 48 23 14.3 24.5 16 19,4 39.5 13.6 3.1 4.1 12.9 1.53 4.8 51 24 13.8 24.5 17 33 29 7.6 2.55 3.25 6.9 18.4 15 65 25 8.5 19.2 18 21 28 5.8 2.6 2.45 5.8 13.5 15 71 IS. 2 6.7 25 19 13.4 IS. 8 7.0 5.6 1.98 2.95 4.3 9.0 61 16.4 16.6 25 20 41 16.4 4.9 2.45 1.5? 1.86 2.85 6.5 31 12.3 46 17.2 21 51 15.6 3.8 1.30 35.5 1.01 1.98 5.0 28 9.0 65 12.9 22 35 9.5 4.7 1.45 45 1.19 1.20 3.7 23.5 7.S 33 9.5 23 26 30 23 0 Q 48 39.5 .60 2.8 27 7.8 44 6.9 24 40 15.9 9.4 lels 32.5 39.5 25 2.1 21 5.1 44 5.4 25 33 23 13.0 19.6 32.5 24.5 16.1 1.6C 14.6 8.4 25 4.1 26 26 23.5 12.5 5.8 13.5 33.5 54 1.4C 10.5 5.8 55 3.25 27 26 21.5 9.7 2.95 9.0 27 58 1.2C 8.2 27 23.5 22 28 15.7 22.5 5.2 3.0 6.9 25 38 1.1C 4.6 18.8 22 23.5 29 33 19.4 10.4 10.5 13.1 70 13.5 4.1 7.8 41 8.8 30 27.5 18.9 9.1 16.0 5.8 65 15.4 3.25 6.0 35.5 5.8 31 62 12.3 8.2 32 13.2 2.3 25.5

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Ulnlnrum Mean gallons Acre -feet Jul 62 9.2 29.7 46.0 919 2,820 Aug 71 9.5 29.4 45.5 910 2,790 Sep 29 3.8 13.2 20.4 395 1,210 Oct 26.5 1.30 10.1 15.6 314 965 HOT 48 1.52 18.1 28.0 544 1,670 Dec 70 .22 15.9 24.6 494 1,510 C alendar year 19 71 .22 22.3 34.5 8,120 24,940 Jam 68 .60 14.2 22.0 440 1,350 Feb 24.5 1.10 7.06 10.9 198 607 Mar 71 1.00 24.7 38 2 764 2,350 Apr 36.5 2.45 15.9 24'. 6 477 1,460 May 65 6.7 29.1 45.0 903 2,770 Jun 61 3.25 19.5 30.2 584 1,790 P Lacal year 1937 -38 ...... 71 .22 19.0 29.4 6,940 21,290 °° ISLAND OF IViUI

Koolau ditch at Haipuaena, near Huelo

Location.- Parshall flume, lat. 20°51'15", long. 156°11'15", 1,000 feet upstream from intake from Puohokamoa Stream, 3i miles southeast of Kallua, and 4.7 miles southeast of Huelo. Records available.- April 1932 to June 1938. Extremes - Maximum discharge during year, 194 million gallons a day (300 second-feet) "ay 11 (gage height, 4.85 feet); minimum, 9.0 million gallons a day (13.9 second- feet) Jan. 1. 1932-38: Maximum discharge, 200 million gallons a day (309 second-feet) Nov. 18, 1935 (gage height, 5.11 feet); no flow at times, when water was shut out of ditch. Remarks.- Records excellent except those for period when clock was not running, Nov. 20 to Dec. 3, which were computed on basis of records for station on Koolau ditch at Keanae and are good. Flow regulated by flood gates. No diversions. Water used for domestic supply and Irrigation in central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec, Jan. Feb. Mar. Apr. Bay June

1 73 1S3 SO 106 137 65 76 94 34 67 143 162 2 125 183 99 149 103 60 108 89 34 96 176 162 3 169 176 10S 155 63 56 113 108 64 131 169 119 4 176 155 162 131 67 52 85 76 125 67 149 99 5 176 137 113 137 120 50 99 137 113 59 103 94 6 176 155 94 80 99 48 72 89 59 140 94 80 7 169 113 137 104 119 46 137 72 42 143 85 108 8 143 125 149 119 176 44 103 67 113 125 86 162 9 103 169 108 72 169 42 149 63 143 137 155 183 10 S5 183 89 67 162 41 85 59 143 125 176 176 11 103 162 137 59 169 39 76 85 103 99 176 137 12 162 155 108 55 125 42 67 98 125 149 176 108 13 99 137 80 80 85 96 59 113 176 89 155 94 14 125 162 76 63 76 176 59 85 176 120 113 169 15 137 183 125 55 67 149 55 67 176 119 103 143 16 119 169 94 50 59 89 52 63 176 119 85 155 17 155 162 72 48 55 67 110 63 176 162 76 125 18 113 156 67 52 52 55 92 67 169 125 72 155 19 94 131 72 52 48 50 59 52 155 108 104 162 20 162 119 59 44 45 46 67 50 155 99 169 119 21 176 108 55 42 105 44 85 46 162 89 183 108 22 169 94 59 41 160 46 55 44 162 85 155 94 23 143 143 131 55 160 159 48 42 162 85 169 76 24 169 103 76 96 160 176 134 41 143 76 176 72 25 162 131 89 137 160 149 125 39 108 85 137 67 26 143 143 76 67 125 149 149 35.5 94 72 176 63 27 143 149 55 55 100 162 143 35.5 8E 162 143 134 28 113 162 52 50 85 143 143 34 80 125 137 137 29 155 137 91 66 100 183 149 76 76 169 72 30 149 125 59 102 75 123 149 72 72 155 63 31 169 94 69 34.5 137 67 162

Million gallons a day Second- Total run-off Month feet (mean) Million Mailman Minimum Mean gallons Acre-fee t Jul 176 73 140 217 4,360 13,360 Augi 183 94 145 224 4,500 13,820 Sep 162 52 92.4 143 2,770 8,510 Oct 155 41 79.3 123 2,460 7,640 HOT 176 45 108 167 3,230 9,9OO Dec 183 34.5 86.5 134 2,680 8,230 C alendar year 19 183 34.5 118 183 42,960 131,800 Jan 149 48 98.1 152 3,040 9,330 Fob 137 54 68.4 106 1,910 6,870 Mar 176 34 118 183 3,670 11.260 Apr 162 59 107 166 3,210 9,840 May 183 72 140 217 4,330 13.280 Jun 183 63 120 186 3,600 11,040 PIscal year 1937 -38...... 183 34 109 169 39,760 122,000 ISLAND OF MAUI

Puohokamoa Stream near Huelo

Location.- Lat. 20°51'20", long. 156°11'25", Just upstream from Spreckels ditch Inflow and trail crossing, 3 miles southeast of Kallua, and 5.1 miles southeast of Huelo. Drainage area.- 2.6 square miles. Records available.- December 1910 to June 1938. Average discharge.- 21 years (1917-38), 22.0 million gallons a day (34.0 second-feet). Extremes.- Maximum discharge during year, 1,430 million gallons a day (2,210 second-feet) Apr. 7 (gage height, 7.54 feet), from rating curve extended above 400 million gallons a day: minimum, 2.8 million gallons a day (4.3 second-feet) Feb. 26, 27. 1910-38: Maximum discharge, that of Apr. 7, 1938; minimum, 0.1 million gallons a day (0.2 second-foot) Nov. 17, 1929, former site and datum. Remarks.- Records good except those for periods of missing gage heights, Feb. 12-15, flay 24 to June 3, June 10-25, which were computed on basis of records for stations on nearby streams and are poor. Kula pipe line diverts small amount of water above station, at altitude 4,300 feet for domestic supply.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, In million gallons a day) 2.4 1.8 61 4.0 440 4.3 2.1 100 4.6 550 1.0 6.9 2.6 165 6.0 6Y5 1.2 14.4 3.0 252 1.6 32 3.6 340

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 1 20.5 220 10.2 9.9 28.5 6.4 15.9 9.5 3.2 5.9 22.6 20 2 23.5 183 11.9 22.5 12.7 5.9 13.6 9.9 3.5 12.3 66 22 3 38 106 19.7 34.5 6.6 6.6 13.6 21.5 6.8 29.5 38 17 4 47 30 34 32 6.6 5.1 9.2 8.9 28 7.2 22 12.3 5 56 21.5 15.9 27.5 19.4 4.8 10.6 28 12.6 6.9 13.6 9.9 6 93 17.5 13.1 IliO 10.2 4.6 7.9 9«2 7.0 297 18.0 6.6 7 42 14.4 29.5 14.5 26 4.3 27.5 6J9 3.9 570 13.6 16.3 8 19.7 22 31 21.6 76 3 9 32 6.4 115 193 13.8 35 9 12.7 48 14.0 9 2 36.5 3^9 30 6.4 57 268 78 212 10 9.9 92 11.5 7)9 29.5 3 9 9.5 5.3 18.0 280 127 90 11 13.7 42 29.5 6.6 78 3.5 7.6 5.3 13.8 95 67 25 12 38.5 30 17.0 6.1 17.8 3.5 6.6 6.4 21.5 164 69 16 13 12.7 21.5 10.6 9.5 11.5 40 6.4 8.0 61 35.5 21 13 14 24.5 42 9 2 7.9 9.2 98 6.9 9.0 66 63 14.0 50 15 22.5 156 13J5 6.1 7.6 36 5.1 5.3 67 52 14.0 28 16 16.9 59 11.9 5.1 6.9 13.1 5.1 4.3 104 66 12.3 25 17 35 30 7.9 5.1 6.1 8.2 28.5 5.4 184 28 8.9 17 18 17.0 26 6.9 4.8 5.6 7.2 12.8 7.3 224 18.5 7.9 30 19 11.9 17.5 7.6 5.6 5.3 5.9 6.4 4.3 166 14.0 26 28 20 44 15.9 6.4 5.1 5.1 5.1 5.6 3.7 40 11.0 109 14 21 67 13.6 5.6 4.3 70 4.6 5.1 3.5 41 9.5 183 11 22 38.5 11.0 6.1 3.9 77 4.6 4.8 3.4 26 8.9 38,5 9.5 23 26 48 25.5 4.1 75 80 4.1 3.2 34 8.6 64 8.5 24 44 16.9 8.6 19.9 40 58 68 3.2 21.5 6.9 60 7.5 25 34 20.6 13.1 20.5 41 27 20 3.0 13.1 8.9 27 6.4 26 22 27 14.6 6.4 13.6 68 195 3.0 10.6 7.2 100 6.1 27 21.5 23.5 10.0 5.1 9.9 33 202 3.2 8.9 39 23 27 28 14.9 23 6.4 5.1 8.6 24 69 3.2 7.6 19.6 20 25 29 40 19.1 15.0 11.2 12.4 230 19.8 6.6 8.2 60 8.6 SO 28 17.5 8.6 17.5 7.6 227 18.7 6.1 7.2 46 6.9 31 171 11.9 9.1 42 16.5 5.6 35

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 171 9.9 35.6 65.1 1,100 3,390 Augi 220 11.0 46.0 71.2 1,430 4,370 8ep 34 5.6 14.2 22.0 425 1,300 Oct 34.5 3.9 11.6 17.9 360 1,100 HOT 78 5.1 25.3 39.1 759 2,330 Dec 230 3.5 34.4 53.2 1,070 3,270 0 alandar year 193 250 3.5 33.4 51.7 12,180 37,350 Jan 202 4.1 28.4 43.9 882 2,710 Peb 28 3.0 7.02 10.9 197 604 Mar 224 3.2 44.6 69.0 1,380 4,240 Apr 570 5.9 78.0 121 2,340 7,180 Hay 183 7.9 45.7 70.7 1,420 4,350 Jun 212 6.1 26.9 41.6 806 2,470 PIsoal year 1937- 570 3.0 33.3 51.5 12,170 37,310 90 ISLAND OF MAUI

Manuel Luis ditch at Puohokamoa Gulch, near Huelo

Location.- Sharp-crested weir, lat. 20°51'50", long. 156°11'00", in Puohokamoa Gulch at lower portal of tunnel between Haipuaena and Puohokamoa Streams, 3 miles south­ east of Kallua and 4.4 miles southeast of Huelo. Records available.- December 1917 to June 1938. Average discharge.- 19 years (1918-24, 1925-38), 6.14 million gallons a day (9.50 second-feet;. Extremes.- Maximum discharge during year, 68 million gallons a day (105 second-feet) NOV. 8 (gage height, 3.11 feet); minimum, 0.50 million gallons a day (0.77 second- foot) Apr. 5, 6. 1917-38: Maximum discharge, 116 million gallons a day (179 second-feet) Jan. 14, 1923 (gage height, 4.93 feet), from rating curve extended above 10 million gallons a day by weir and submerged-orifice formulas; no flow Jan. 8, 1937. Remarks.- Records excellent. Ditch is extension of Center ditch and picks up water at altitude of 500 feet from streams between the Kolea and the Waikamol. Flow regulated by gates. Water used for irrigation in central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. HOT. Dec. Jan. Peb. Mar. AP3«1 May June

1 1.52 58 1.14 2.8 9o6 1.30 3 9 1.37 0.62 0.73 2. 7 6.8 2 2.85 64 1.77 4.3 2,7 1.14 2^5 1.14 .62 1.18 19. 0 13.5 3 3.3 30 1.53 8,3 1.37 1.06 3.45 1.73 2.0 5.6 9. 2 3.1 4 7.5 5.2 3.65 11.6 1.86 .91 1.60 .91 28 .73 4. 9 2.15 5 4.0 3.9 2.55 6.9 4.1 .91 1.77 2.15 9.6 .56 2. 25 1.68 6 23 3.1 2.15 1.86 2.05 .85 1.30 .91 1.60 37.5 1. 96 1.45 7 5.0 2.4 5.4 7.4 7.5 .79 4.3 .79 1.30 68 1. 77 1.68 8 2.5 4.7 6.8 8.4 26 .73 7.1 .79 29.5 60 7. 1 8.0 9 1.77 5.5 1.60 2.05 8.5 .73 9.2 .79 25 56 21 5 54 10 1.37 22 1.37 1.68 9.2 .67 1.45 .67 3.45 64 41 27.5 11 1.68 9.1 8.8 1.45 30.5 .56 1.14 1.14 2.6 17.2 22 2.7 12 2.5 5.3 2.6 1.30 4.3 .62 1.06 3.25 4.6 25 14 1 2.3 13 1.45 3.65 1.45 5.5 2.8 10.2 .99 1.53 14.8 2.95 3. 45 1.86 14 2.05 8.3 1.30 3.45 2.15 31.5 .91 1.68 11.8 24.5 2. 7 9.5 15 2.4 41 3.3 1.60 1.68 11.0 .91 1.60 11.1 11.6 2. 15 3.2 16 2.25 12.1 2.4 1.37 1.53 2.8 .85 1.45 18.7 19.4 1. 77 3.4 17 7.0 6.0 1.30 1.22 1.45 1.37 8.2 2.8 44 9.5 1. 30 2.2 18 2.25 5.4 .99 1.22 1.30 1.14 1.86 3.35 60 2.6 1. 14 3.45 19 1.60 3.0 1.37 1.53 1.14 .85 .91 1.37 52 1.86 13. 8 3.65 20 6.6 2.4 .91 1.14 1.06 .79 .85 1.22 26.5 1.53 34 2.3 21 15.6 2.05 .79 .99 18.8 .73 .79 1.06 7.5 1.22 59 1.53 22 4.7 1.53 .85 .91 19.9 .79 .79 .91 4.1 1.14 10. 6 1.30 23 3.65 5.3 6.5 1.22 22 25.5 .79 .85 3.65 1.14 26 1.14 24 13.3 1.53 1.22 13.2 14.4 18.6 16.4 .79 2.5 .85 18. 5 1.06 25 9.9 2.25 1.97 6.0 16.2 8.5 1.58 .73 1.68 1.22 8. 5 .91 26 5.2 1.96 1.14 1.30 3.35 18.2 42 .73 1.37 .85 41 .91 27 5.7 2.05 1.30 1.14 2.25 8.4 35.5 .67 1.14 7.6 4. 5 2.1 28 3.1 2.4 .73 1.14 Ii77 12.0 13.8 .62 1.06 1.86 4. 7 3.0 29 7.0 2.9 1.43 3.45 2.5 59 2.3 .99 .79 17. 0 .91 30 4.5 2.65 .99 3.0 1.45 45 5.0 .85 .73 13. 2 .79 31 51 1.45 1.92 10.4 2.15 .79 4. 1

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 51 1.37 6.65 10.3 206 633 Augi 64 1.45 10.4 16.1 321 985 Sep 8.8 .73 2.31 3.57 69.3 213 Dot 13.2 .91 3.53 5.46 109 336 HOT 30.5 1.06 7.45 11.5 223 686 Dec 59 .56 8.94 13.8 277 850 0 alendar year 193 64 .05 7.51 11.6 2,740 8,420 Jan 42 .79 5.65 8.74 175 538 Feb 3.35 .62 1.32 2.04 37.0 114 Mar 60 .62 12.0 18.6 373 1,150 Apr 68 .56 14.3 22.1 428 1,310 May 59 1.14 13.4 20.7 415 1,270 Jun 54 .79 6.60 8.66 168 516 P Isoal year 1937-38 ...... 68 .56 7.68 11.9 2,800 8,600 ISLAM) OF m.Ul 91

Spreckels ditch at Wahlnepee, near Huelo

Location.- Parshall flume, lat. 20°51'25", long. 156°11'20", between Puohokamoa and Alo Streams, 700 feet downstream from Intake from Puohokamoa Stream, 2i miles west of Keanae, and 4.4 miles southeast of Huelo. Records available.- August 1928 to June 1938. Extremes.- Maximum discharge during year, 92 million gallons a day (142 second-feet) Apr. 6 (gage height, 3.05 feet); minimum, 0.03 million gallons a day (0.05 second- foot) occasionally. 1928-38: Maximum discharge, 126 million gallons a day (195 second-feet) Dec. 29, 1936 (gage height, 3.71 feet); no flow at times owing to regulation. Remarks.- Records excellent except those for periods when clock was not running, Oct. 29 to Nov. 1, June 8-13, which were computed on basis of records for stations on nearby streams and are poor. Intake of Spreckels ditch Is on Puohokamoa Stream Just below Intake of Koolau ditch, and for ordinary stages It takes all water which passes Koolau ditch Intake. Water used for Irrigation In central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 14.2 71 0.09 0.09 17 0.13 0.28 0.09 0.03 0.03 2.85 5.6 2 7.3 67 .13 13.1 3.1 .09 .09 .09 .03 3.65 28 20.5 3 27.5 55 12.0 29 .09 .06 3.0 .22 .12 20.5 17.2 .76 4 52 19.6 31.5 13.7 .13 .06 .03 .09 16.0 .06 3.25 .22 5 55 2.1 .22 22.5 12.9 .06 .03 .22 .39 .06 .37 .13 6 59 .22 .13 .06 .17 .06 .03 .22 .06 40 1.10 .13 7 43 .13 18.8 11.8 19.4 .06 18.4 .06 .06 3.6 .28 2.7 8 5.4 10.5 19.3 10.8 51 .09 4.2 .06 34 .37 .54 35 9 .09 47 .13 .09 33 .09 21 «06 25.5 8.2 30.5 65 10 .09 67 .13 .06 34 .06 .03 .06 9.3 5-6 55 35 11 2.2 28.5 22 .06 52 .06 .03 .13 1.32 13.8 36.5 .50 12 33 23.5 .33 .09 7.7 .06 .03 .93 19.8 36 37 .15 13 .13 3.9 .09 .32 .17 21 .03 .17 55 4.5 1.66 .15 14 16.1 36.5 .09 .17 .03 63 .03 .13 63 3.75 .33 *29 15 11.0 67 .17 .09 .06 27 .03 .06 63 3.85 .17 6.8 16 2.4 45 .13 .06 .09 .13 .03 .06 63 12.1 .17 4.4 17 27.5 29.5 .09 .06 .09 .06 24 .09 64 7.7 .09 .76 18 .55 21.5 .09 .06 .06 .06 2.55 .13 17.0 .76 .06 9.5 19 .09 .67 .06 .06 .03 .03 .03 .03 1.89 .33 16.0 6.1 20 35.5 .17 .06 .09 .03 .03 .03 .03 5.7 .13 44 .55 21 65 .13 .06 .06 24.5 .03 .03 .03 34.5 .09 67 .40 22 42 .09 .06 .06 59 .03 .03 .03 20 .06 13.8 .13 23 9.9 33 14.7 .06 63 48 .03 .03 34 .06 37.5 .06 24 41 .24 .03 24 43 45 .26 .03 P. 6 .06 41 .06 25 35.5 2.4 1.44 8.4 48 18.1 .09 .03 .13 .06 11.7 .09 26 8.8 13.3 2.65 .06 .76 34 .80 .03 .09 .06 52 .17 27 7.1 6.4 .06 .06 .17 26 1.37 .03 .06 13.1 1.86 10.8 28 .22 9.5 .03 .09 .17 16.7 .64 .03 .06 2.3 2.55 7.4 29 38 3.35 3.85 3.5 .17 67 .22 .03 .06 42 .09 30 19.0 2.45 .03 .80 .17 59 .47 .03 .06 20.5 .09 31 58 .09 .11 15.7 .17 .03 9.8

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum He an gallons Acre-feet Jul 65 0.09 23.1 35.7 717 2,200 ' Augi 71 .09 21.5 33.3 667 2,050 Sep 31.5 .03 4.28 6.62 128 394 Oct 29 .06 4.48 6.93 139 426 HOT 63 .03 15.7 24.3 470 1,440 Dec 67 .03 14.2 22.0 442 1,360 C alendar year 193 71 .03 14.2 22.0 5,180 15,910 Jan 24 .03 2.52 3.90 78.0 239 Peb .98 .03 .115 .178 3.22 9.9 Map 64 .03 17.3 26.8 537 1,650 Apr 40 .03 6.03 9.33 181 555 May 67 .06 18.5 28.6 575 1,760 Jun 65 .06 8.07 12.5 242 743 PIscal year 1937 71 .03 11.4 17.6 4,180 12,830

*Partly estimated. 92 ISLAND OF MAUI

Waikamoi Stream above Wailoa ditch, near Huelo Location.- Lat. 20°51'45", long. 156°11'55", 500 feet upstream from intake of Wailoa ditch, a quarter of a mile upstream from Spreckels ditch trail, and 3.8 miles south­ east of Huelo. Drainage area.- 4.4 square miles. Records available.- January 1922 to June 1938. Average discharge.- 16 years (1922-38), 16.6 million gallons a day (25.7 second-feet). Extremes.- Maximum discharge during year, 3,910 million gallons a day (6,050 second-feet) Apr. 7 (gage height, 8.91 feet), from rating curve extended above 370 million gallons a day; minimum, 1.01 million gallons a day (1.56 second-feet) Mar. 1. 1922-38: Maximum discharge, 4,660 million gallons a day (7,210 second-feet) Oct. 16, 1924 (gage height, 10.45 feet), from rating curve extended above 370 million gallons a day; minimum, 0.4 million gallons a day (0.6 second-foot) Nov. 16, 1929. Remarks.- Records excellent except those for periods when clock was not running, Jan. 23, 24, Mar. 29 to Apr. 4, Apr. 15-29, June 14-16, which were computed on basis of records for stations on Alo, Kaaiea, and Oopuola Streams. Haleakala ranch and Kula pipe lines divert small quantities of water above station. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons day) 1.0 1.12 1.8 14.5 3.2 129 5.0 590 1.2 2.25 2.0 23 3.6 195 6.0 1,070 1.4 4.5 2.4 46 4.0 277 7.0 1,340 1.6 8.7 2.8 80 4.5 410 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 20. E 222 5.4 5.4 19.0 3.4 9.8 6.6 1.12 3.2 10.8 14.9 2 23 149 6.4 12.6 7.0 2.95 7.1 6.0 1.86 4.2 45 23 3 36 84 13.7 21.5 3.55 2.7 7.1 22 2.6 5.5 27 10 6 4 64 17.5 30 21 3.3 2.5 4.7 6.9 22.5 4.0 13.3 6 6 5 57 12.0 11.1 26 10.7 2.25 5.3 30 11.7 3.4 9.8 5 3 6 82 9.5 8.0 7.3 7.1 2.05 3.95 8.5 7.8 506 15.3 4 4 7 38 7.8 21 8.2 28 1.80 30 4.9 3.3 1,180 9.5 8 4 8 15.9 10.9 28 13.3 91 1.60 18.6 3.95 86 275 7.2 29 9 8.5 36 8.5 6.0 45 1.46 35.5 4.1 70 397 49 181 10 6.0 55 6.6 4.4 28 1.66 6.0 3.3 15.6 362 107 61 11 7.6 26 22.5 3.7 64 1.36 4.1 3.15 15.8 78 55 12.0 12 33.5 18.7 11.4 3.15 13.2 1.31 3.4 3.8 13.0 122 65 7.6 13 9.0 12.6 6.4 5.1 7.1 23.5 2.95 4.6 42 27 16.0 6.2 14 15.7 26 5.1 4.2 5.1 82 2.7 7.1 57 33 10.0 25 15 16.9 152 8.0 3.05 4.1 30.5 2.45 4.1 75 30 10.9 14 16 11.5 39 8.2 2.7 3.55 8.0 2.2 2.95 105 50 10.4 18 17 19.7 19.2 5.3 2.45 3.15 4.5 16.2 3.15 195 20 5.3 *10.0 18 10.9 14.5 3.8 2.45 2.9 4.1 9.4 4.4 244 10.0 4.4 16.7 19 6.9 9.0 3.8 2.8 2.6 2.95 3.8 2.7 194 7.5 15.6 14.5 20 48 7.3 3.15 2.6 2.35 2.6 2.8 2.25 45 6.0 80 9.8 21 42 7.3 2»8 1.99 53 2.2 2.35 2.05 27.5 5.2 151 5.8 22 27.5 5,6 2.9 1.80 73 2.1 *2.25 1.86 10.2 4.5 28 4.7 23 15.6 35.5 17.1 1.73 59 58 2.1 1.60 23 5.0 49 3.95 24 34 10.3 6.0 8.3 28.5 50 40 1.50 16.4 4.0 45 3.7 25 22 15.6 7.1 11.8 31 16.8 17.1 1.41 8.2 6.0 21 3.15 26 13.9 21 22 3.3 9.2 56 217 1.41 6.2 5.3 87 3.05 27 13.6 20.5 7.9 2.35 5.8 24.5 179 1.26 5.1 18.0 15.2 13.2 28 9.2 17.8 4.1 2.2 4.5 13.7 58 1.22 4.4 14,0 13.0 14.5 29 26.5 12.0 6.0 4.7 7.0 150 19.3 3.9 4.5 57 5.4 30 18.2 10.6 4.9 12.6 4.1 222 11.0 3.5 3.95 35 3.7 31 193 6.6 4.6 29 10.6 3.3 22

Million gallons a day Second- Total run-off Month feet (mean) Million . . . Haxljnum Minimum Mean gallons Jul 193 6.0 30.5 47.2 946 2,900 Augi 222 5.6 35.2 54.5 1,090 3,350 Sep 30 2.8 9.90 15.3 297 912 Oct 26 1.73 6.88 10.6 213 655 Hov 91 2.35 20.9 32.3 626 1,920 Dec 222 1.31 26.0 40.2 807 2,480 C alendar year 193 390 1.31 25.2 39.0 9,200 28,260 Jan 217 2.1 23.8 36.8 737 2,260 Feti 30 1.22 5.24 8.11 147 450 Mar 244 1.12 42.8 66.2 1,330 4,080 Apr 1,180 3.2 106 164 3,190 9,800 May 151 4.4 35.2 54.5 1,090 3,340 Jun 181 3.05 18.0 27.9 539 1,650 Placal year 1937- 1,180 1.12 30.2 46.7 11,010 33,800

Partly estimated. ISLAND OF MA.UI 93

Alo Stream near Huelo

Location.- Lat. 20°51'50", long. 156°11'45", Just upstream from Spreckels ditch Inflow and trail crossing and 3.8 miles southeast of Huelo. Drainage area.- Q.S, square mile. Records available.- December 1910 to June 1938. Average discharge.- 27 years (1911-37), 5.11 million gallons a day (7.91 second-feet). Extremes.- Maximum discharge during year, 344 million gallons a day (532 second-feet) Apr. 7 (gage height, 3.52 feet), from rating curve extended above 50 millions gallons a day; minimum dally discharge, 0.55 million gallons a day (0.85 second-foot) Feb. 28. 1910-38: Maximum discharge, 1,600 million gallons a day (2,480 second-feet) Nov. 18, 1930 (gage height, 6.90 feet), from rating curve extended above 15 million gallons a day; minimum, 0.2 million gallons a day (0.3 second-foot) Nov. 22, 23, 1932. Remarks.- Records good except those for period of missing gage heights, Jan. 22 to Mar. 18, which were computed on basis of records for Kaaiea Stream near Huelo and are fair. No diversions. Water used for Irrigation In central Maul.

Rating table, fiscal year 1937-38 gage height, in feet, and discharge, in gallons a day) 0.4 O.S5 1.2 8.0 3.2 76 .6 .73 1.4 15.0 2.5 120 1.80 1.6 3.5 1.9

Discharge, in million gallons, fiscal year July 1937 to June

Day July Aug. Sept. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May June 1 S.O 34.5 1.62 S.75 7.7 1.26 3.1 2.4 0.60 1.20 5.7 9.8 S S.9 40 2.4 5.6 3.0 1.11 S.5 3.5 .65 2.6 14.2 16.9 3 6.4 31.5 3.15 10.3 Io50 1.01 4.3 10.5 3.5 6.3 11.2 4.5 4 7.3 5.4 5.0 13.4 1.95 .93 1.80 2.3 10.5 1.38 9.6 3.1 5 7.3 4.0 S.55 6.4 5.7 .87 1.68 7.0 3.5 1.11 3.55 3.5 6 15.8 3.55 3.7 2.35 2.1 .83 1.38 3.0 2.0 61 3.1 S.I 7 7.8 2.85 5.8 7.6 7.4 .78 3.1 S.I 1.40 105 2.4 3.3 8 3.3 6.7 4.9 7.6 16.4 .73 4.3 1.9C 30 IS. 9 3.0 11.2 9 2.4 7.9 S.25 S.I 6.5 .70 5.1 1.7C 11.0 38 SS S5 10 2.0 SO 1.95 1.80 9.1 .67 1.62 1.5C 4.5 46 18.7 19.3 11 S.S5 8.0 8.8 1.56 S4.5 .65 1.38 1.6C 3.3 11.9 11.7 3.3 12 3.25 8.8 4.2 1.32 3.65 .65 1.15 2.1 7.0 26 30 3.45 13 1.74 5.3 1.95 5.1 2.55 5.1 1.06 2.6 16.0 6.1 4.5 2.4 14 S.9 9.4 1.66 3.45 S.O 18.6 .96 3.2 1S.O 25 2.85 10.0 15 3.85 29 2.6 1.68 1.68 7.6 .87 1.5C 9.0 10.6 3.0 4.3 16 3.8 11.6 S.S5 1.38 1.44 3.5 .83 1.2C 1S.O 17.7 2.25 7.5 17 11.3 8.S 1.38 1.15 1.20 1.44 6.8 S.4 25 6.7 1.74 4.1 18 3.3 4.3 1.15 1.11 1.11 1.11 S.15 4.0 46 3.4 1.601 5.8 19 S.4 3.5 1.50 1.06 1.01 .96 1.06 1.8C 33 2.65 17. S 7.1 20 4.8 3.0 1.11 1.45 .96 .87 .93 1.3C 7.2 3.1 SS 4.2 21 26 S.4 .96 1.06 14.8 .83 .87 1.1C 9.3 1.80 35 2.55 22 9 2 S.O 1.01 .96 13.3 .83 .84 .9£ 9.1 1.62 8.4 3.1 23 5^4 5.1 6.1 .96 16.6 19.9 .90 .BE 8,4 1.80 19.6 1.74 24 11.9 2.4 1.62 9.7 SS 10.3 8.0 .74 4.9 1.32 13.4 1.56 25 13.3 3.3 3.3 6.2 10.4 4.6 3.3 .66 3.3 3.05 7.3 1.38 26 7.4 3.7 1.32 1.56 3.0 9.3 3S .60 3.55 1.38 S7.5 1.36 27 6.5 S.9 1.15 l.SO S.S 6.4 54 .56 3.1 6.5 53 4.1 SB 3.3 3.75 1.06 1.26 1.74 7.8 14.0 .55 1.80 3.S 7.2 9.3 29 10.0 3.7 1.60 4.3 S.6 60 4.0 1.63 1.43 1S.O 1.74 30 7.2 3.05 1.11 S.75 1.50 44 6.0 1.38 1.26 10.1 1.44 31 SS.& 1.88 S.15 10.0 3.7 1.26 8.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 36 1.74 7.07 10.9 S19 673 Aug 40 1.88 8.73 13.5 371 830 Sep 8.8 .96 3.61 4.04 78.2 240 Oct IS. 4 .96 3.55 5.49 110 337 HOT S4.5 .96 6.3S 9.78 189 583 Dec 60 .65 7.17 11.1 2S3 682 C alendar year 192 60 .65 7.30 11.1 S,630 8,060 Jan 54 .83 5.60 8.66 173 532 Fob 10.5 .56 2.S4 3.47 63.6 192 Mar 46 .60 8.80 13.6 273 837 Apr 105 1.11 13.7 31.3 410 1,S60 May 52 1.50 13.2 18.9 380 1,170 Jun SB 1.36 5.89 9.11 177 543 P -seal year 1937- 105 .55 7.03 10.9 3,560 7,880 94 ISLAND OF MAUI

Kaaiea Stream near Huelo

Location.- Concrete weir control, lat. 20°52'05", long. 156°12'15", 700 feet upstream from Hamakua ditch trail crossing, 2 miles southeast of Kailua, and 3i miles southeast of Huelo. Drainage area.- 0.5 square mile. Records available.- December 1921 to June 1938. Average discharge.- 16 years (1922-38), 4.96 million gallons a day (7.67 second-feet). Extremes.- Maximum discharge during year, 401 million gallons a day (620 second-feet) Apr. 7 (gage height, 3.91 feet), from ratine curve extended above 130 million gallons a day; minimum, 0.48 million gallons a day (0.74 second-foot) Feb. 28. 1921-38: Maximum discharge, 2,300 million gallons a day (3,560 second-feet) Nov. 18, 1930 (gage height, 7.93 feet, former site and datum), from rating curve extended above 50 million gallons a day; minimum, 0.3 million gallons a day (0.5 second-foot) July 17, 1922, Mar. 22, 1927, Nov. 16, 1929, Oct. 26, 1933. Remarks.- Records excellent except those above 200 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maui.

Rating table, fiscal year 1937-3S (gage height, In feet, and discharge, In million gallons a day) 0 S 0.26 0.7 6.1 1.6 49 3 .60 .8 8.7 2.0 79 4 1.30 .9 11.5 2.5 126 5 2.4 1.0 15.2 6 4.0 1.3 30.5

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June 1 1.69 33 1.68 2.15 7.2 1.04 3.0 2.0 0.56 0.95 6 .2 8.0 2 2.9 36 2.15 4.8 3.55 .95 2.15 3.0 .65 2.2 15 .5 15.1 3 6.5 IS. 6 3.3 10.4 1.58 .81 3.5 10.3 2.45 5.4 10 9 4.2 4 7.2 4.8 5.6 10.2 1.80 .75 1.58 2.3 10.6 1.20 8 7 2.7 5 6.9 3.3 2.7 7.1 6.0 .75 1.5S 7.0 3.35 .88 3 .65 2.0 6 15.7 2.75 2.55 2.3 2.2 .70 1.20 2.3 1.39 58 3 .3 1.68 7 6.9 2.3 4.9 6.0 7.6 .70 2.6 1.68 1.04 106 3 .55 3.1 8 3.3 4.5 4.9 6.0 16.2 .70 4.6 1.68 30 14.0 3 .65 9.9 9 2.0 7.2 2.3 2.3 7.0 .65 5.2 1.47 10.9 40 21 27 10 1.68 19.3 2.0 1.80 8.1 .70 1.47 1.30 4.4 49 22 19.0 11 1.S2 8.3 8.4 1.58 22 .65 1.20 1.47 2.55 10.6 12 .1 3.3 12 3.95 8.6 4.4 1.30 4.0 .65 1.04 2.05 7.2 25.5 19 .7 2.8 13 1.47 4.9 2.0 17.4 2.4 5.8 .95 2.55 15.6 5.6 4 .6 2.15 14 2.9 9.1 1.6S 3.5 1.91 18.0 .81 2.15 12.0 21.5 2 .7 10.0 15 2.9 28.5 2.3 1.68 1.47 7.5 .75 1.20 8.9 9.4 3 .05 4.5 16 3.8 12.6 2.55 1.39 1.30 2.55 .70 1.04 10.8 15.9 2 .15 7.1 17 10.0 7.5 1.47 1.20 1.12 1.47 6 = 5 2.35 26 6.1 1 .53 4.0 18 3.0 6.8 1.20 1.20 1.04 1.12 2.45 3.95 41 3.15 1 .39 6.7 19 1.91 3.5 1.47 1.04 .88 .95 .95 1.30 23 2.15 15 .4 6.8 20 4.1 2.7 1.20 1.49 .81 .81 .88 .95 6.4 1.80 22 .6 3.15 21 25 2.3 1.04 1.12 12.2 .75 .81 .88 8.6 1.47 36 2.3 22 8.4 1.91 1.04 .88 11.7 .81 .75 .81 7.9 1.30 7 .2 1.91 ZZ 5.4 6.2 6.5 .88 16.7 19.1 .81 .70 7.7 1.47 18 .5 1.58 24 10.0 2.4 1.68 8.6 14.8 10.4 7.8 .65 4.8 1.20 13 .0 1.39 25 10.7 3.8 3.7 5.8 13.7 4.3 3.15 .60 2.7 1.95 7 .1 1.20 26 5.6 3.15 1.47 1.68 2.7 9.8 32.5 .56 2.0 1.30 26 .5 1.12 2V 5.6 3.65 1.39 1.30 1.80 6.7 49 .56 1.68 6.6 5 .0 4.9 28 2.8 4.2 1.12 1.20 1.47 5.3 14.0 .52 1.47 3.7 6 .2 8.9 29 9.6 3.3 1.84 3.9 2.15 54 4.0 1.20 1.39 14 .6 1.68 30 6.4 3.4 1.30 3.3 1.20 44 5.6 1.12 1.30 8 .9 1.39 31 23.5 2.0 1.92 10.3 3.45 .95 8 .5

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 25 1.47 6.57 10.2 204 625 Augi 36 1.91 8.41 13.0 261 800 Sep 8.4 1.04 2.66 4.12 79.8 245 Oct 17.4 .88 3.72 5.76 115 354 HOT 22 .81 5.89 9.11 177 542 Dec 54 .65 6.86 10.6 213 653 C alendar year 192 54 .65 6.94 10.7 2,530 7,770 Jan 49 .70 5.32 8.23 165 506 Feb 10.3 .52 2.05 3.17 57.3 176 Mar 41 .56 8.35 12.9 259 795 Apr 106 .88 13.4 20.7 401 1,230 May 36 1.39 10=8 16.7 334 1,030 Jun 27 1.12 5.65 S.74 170 520 FIscal year 1937- 38 106 .52 6.67 10.3 2,440 7,480 ISLAND OF MAUI 95

Oopuola Stream near Huelo Location.- Concrete weir control, lat. 20°52'15", long. 156°12'30", between Kaalea and Nalliillhaele Streams, 100 feet upstream from Walloa ditch Intake, 300 feet upstream from ditch trail, and 4 miles southeast of Huelo. Drainage area.- 0.2 square mile. Records available.- August 1930 to June 1938. December 1910 to June 1915, at site half a mile downstream; records not equivalent. Extremes.- Maximum discharge during year, 212 million gallons a day (328 second-feet) Apr. 6 (gage height, 4.15 feet), from rating curve extended above 20 million gallons a day by tests on model of station site; minimum not determined owing to missing gage record. 1930-38: Maximum discharge, 324 million gallons a day (501 second-feet) Jan. 18, 1932 (gage height, 5.12 feet), from rating curve extended above 20 million gallons a day by tests on model of station site; minimum, 0.09 million gallons a day (0.14 second-foot) Feb. 18, 19, 1936. Remarks.- Records excellent except those for periods of missing gage heights, Jan. 28 to Mar. 5, Apr. 15-23, which were computed on basis of records for stations on nearby streams and are poor. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gal­ lons a day) 1.6 0.06 2.0 2.6 2.6 1.7 .28 2.2 5.8 2.8 l.S .76 2.4 11.2 3.0

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oet. Nov. Dec. Jan. Feb. Mar. Apr. Bay June

1 0.55 10.2 0.64 0.86 3.1 0.48 1.43 1.20 0.18 0.19 1.90 3.75 2 1.10 12.1 .95 1.48 1.60 .44 1.02 1.40 .40 .41 5.0 8.0 3 1.71 6.6 1.24 3.7 .82 .44 1.42 3.0 .80 1.32 3.65 2.25 4 1.76 1.90 1.60 4.3 .95 .44 .76 1.30 2.2 .28 3.9 1.43 5 2.35 1.43 1.15 2.35 2.15 .35 .70 4.0 1.20 .19 1.52 1.10 6 4.9 1.28 1.09 .82 .88 .32 .53 1.50 .70 21.5 1.17 .95 7 3.0 1.17 2.2 3.15 3.05 .32 .87 .95 .53 39 .88 1.55 8 1.26 1.95 1.75 3.55 6.0 .32 1.38 .80 8.6 3.0 1.63 6.4 9 .95 3.15 .88 .88 2.8 .32 1.83 .70 4.6 11.7 9.0 11.6 10 .76 6.0 .82 .64 3.15 .32 .64 .62 2.0 12.8 9.5 8.5 11 .76 3.3 6.0 .59 9.0 .35 .48 .64 1.10 1.89 4.9 l.'JO 12 .95 3.3 1.64 .48 1.90 .35 .44 .72 2.1 4.7 9.9 1.64 13 .70 1.70 .88 2.25 1.02 .64 .44 .85 5.0 .83 2.1 1.10 14 .82 3.4 .70 1.95 .82 6.3 .44 1.00 3.6 6.4 1.26 4.1 15 .88 9.2 .90 .76 .70 3.15 .40 .75 3.15 5.7 1.35 2.2 16 1.18 3.55 .88 .53 .59 1.17 .35 .55 2.85 5.6 1.02 2.8 17 3.2 2.5 .59 .48 .53 .70 2.25 .48 7.5 2.5 .76 1.90 18 1.02 2.6 .48 .48 .44 .59 .97 .70 9.7 1.50 .70 2.7 19 .78 1.35 .64 .44 .40 .53 .40 .50 5.1 1.00 8.4 2.6 20 1.92 1.10 .48 .56 .40 .48 .35 .40 2.05 .SO 8.0 1.62 21 8.4 .95 .44 .59 4.5 .44 .35 .35 2.35 ,64 14.8 1.17 22 3.5 .76 .40 .40 4.1 .48 .32 .30 2.1 .50 3.2 1.02 23 1.70 1.06 1.69 .35 5.8 8.0 .25 .27 1.70 .56 8.4 .88 24 3.8 .82 .53 4.8 5.8 4.2 2.85 .25 1.17 .48 4.3 .76 25 5.0 1.17 1.31 2.7 6.8 2.0 .86 .23 .64 ,71 3.1 .70 26 2.5 .82 .44 .88 1.26 2.95 9.7 .21 .44 .64 10.6 .70 27 2.45 1.02 .40 .70 .82 2.9 15.7 .20 .40 1.74 2.25 1.07 28 1.26 1.64 .32 .59 .71 2.7 9.0 .18 .32 1.39 3.0 3.45 29 2.95 1.11 .32 1.49 1.02 19.4 3.0 ,32 .53 5.5 .88 SO 2.25 1.31 .35 1.42 .64 17.7 2.3 .25 .48 3.7 .70 31 5.3 .70 .97 4.8 1.50 .19 3.2

Million gallons a day Second- Total run-off Month feet (Mean) Million Maximum Minimum He an gallons Acre -feet Jul 8.4 0.55 2.25 3.48 69.7 214 Aug 12.1 .70 2.88 4.46 89.1 274 Sep 6.0 .32 1.06 1.64 31.7 97 Oet 4.3 .35 1.44 2.23 44.6 137 HOT 9.0 .40 2.39 3.70 71.8 220 Dec 19.4 .32 2.70 4.18 83.6 256 C alendar year 19S 22 .32 2.59 4.01 945 2,900 Jan 15.7 .25 2.03 3.14 62.9 193 Fefc 4.0 .18 .859 1.33 24.0 74 Mar 9.7 .18 2.36 3.65 73.2 225 Apr 39 .19 4.30 6.65 129 396 May 14.8 .70 4.47 6.92 139 425 Jun 11.6 .70 2.64 4.08 79.3 243 Piecal year 1937. 39 .18 2.46 3.81 898 2,750 96 ISLAND OF MAUI

Nailiilihaele Stream near Huelo

Location.- Lat. 20°52'30", long. 156°13'05", 200 feet upstream from Walloa ditch Intake, 700 feet upstream from New Hamakua ditch trail, li miles south of Kailua.and 2i miles southeast of Huelo. Drainage area.- 2.8 square miles. Records available.- December 1910 to June 1918, August 1919 to June 1938. Average discharge.- 17 years (1920-24, 1925-38), 22.9 million gallons a day (35.4 second- feet ). Extremes.- Maximum discharge during year, 3,800 million gallons a day (5,880 second-feet) Apr. 7 (gage height, 8.07 feet), from rating curve extended above 130 million gallons a day; minimum, 3.6 million gallons a day (5.6 second-feet) Feb. 28, Mar. 1. 1910-18, 1919-38: Maximum discharge, that of Apr. 7, 1938; minimum, 0.45 million gallons a day (0.70 second-foot) July 14, 1920. Remarks.- Records good except those above 150 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, in million gallons a day) 1.8 1.2 2.8 4.5 470 2.0 4.4 3.0 5.0 710 2.2 10.0 3.3 120 5.5 1,010 18.6 3.6 181 31 4.0 290

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Peb. Mar. Apr. May June 1 11.3 297 9.7 11.3 32.5 7.8 19.7 11.6 4.0 6.8 38 41 2 18.3 272 12.0 20.5 16.1 7.1 15.3 10.4 4.9 11.9 96 73 3 37 146 17.6 55 8.4 6.6 18.0 71 12.5 30.5 50 21 4 52 30.5 27 54 8.4 6.1 12.0 11.5 44 8.1 33 15.3 6 45 21.5 13.9 30.5 26 5.8 12.7 38.5 14.5 6.6 16.2 12.7 6 108 18.7 12.7 12.0 11.2 5.6 10.0 12.0 7.4 498 18.5 11.2 7 37 15.8 26 25.5 43 5.4 19.0 9.4 5.6 846 13.1 19.0 8 18.2 26.5 23.5 33 107 4.9 62 9.0 226 134 16.5 41 9 12.7 49 12.3 10.8 35.5 4.6 32.5 8.7 60 372 134 232 10 io.a 120 11.2 9.4 34.5 4.6 11.6 7.4 20.5 431 164 128 11 13.8 52 41 8.4 128 4.4 9.7 7.8 13.1 73 68 18.6 12 33.5 40 17.8 7.8 18.8 4.4 9.0 8.4 33 197 115 15.8 13 11.2 23.5 10.8 16.1 13.1 43 8.4 10.7 94 32 22 13.1 14 22 52 9.7 13.1 11.2 133 V.8 9.9 73 112 14.8 63 15 20.5 216 11.2 8.1 9.7 39.5 7.1 6.6 54 46 17.5 25 16 17.8 87 11.3 6.8 8.7 13.9 6.6 6.1 94 135 12.7 34 17 47 33.5 8.4 6.6 7.8 8.4 43 10.2 236 26 10.4 20 18 16.2 28.5 7.4 6.6 7.1 7.4 15.6 15.7 317 17.2 9.4 35 19 12.0 17.7 8.1 6.1 6.6 6.6 8.4 6.6 197 13.5 97 30.6 20 32 15.3 6.8 8.9 6.1 5.8 6.8 5.8 41 11.6 154 15.8 21 141 13.1 6.3 6.6 89 5.4 6.6 5.4 54 10.0 265 12.3 22 43 11.2 6.3 5.6 71 5.6 6.3 5.1 37 9.7 36 10.8 23 27.5 49 29 5.6 95 128 6.1 4.9 42 9.7 95 9.7 24 56 13.9 8.7 34.5 67 59 69 4.6 25.5 8.1 82 8.7 25 52 19.6 15. a 26.5 68 23.5 19.4 4.4 15.8 10.8 36.5 8.1 26 25 21 14.8 8.4 15.3 85 286 4.2 12.7 8.7 176 7.4 27 23.5 21.5 9.4 6.6 11.6 35 405 4.R 11.2 41 24 29 28 15.3 22 7.1 6.3 10.0 21.5 82 3.8 9.7 21 28.5 43 29 59 17.4 11.3 17.4 12.7 374 19.6 8.7 9.0 108 10.4 30 34 15.3 8.4 16.4 9.0 371 23.5 7.8 8.1 54 8.4 31 212 11.2 9.5 57 16.4 7.1 42 1 Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 212 10.8 40.8 63.1 1,26O 3,880 Augi 297 11.2 57.3 88.7 1,780 5,460 Sep 41 6.3 13.8 21.4 415 1,270 Oct 55 5.6 15.9 24.6 494 1,520 Hov 128 6.1 32.9 50.9 988 3,030 Dec 374 4.4 48.1 74.4 1,490 4,570 C alendar year 19 37 ...... 435 4.4 43.0 66.5 15,710 48,200 Jan 405 6.1 41.1 65.6 1,280 3,910 Peti 71 3.8 11.2 17.3 314 964 Mar 317 4.0 57.5 89.0 1,780 5,470 Apr 846 6.6 105 162 3,140 9,650 May 265 9.4 66.0 102 2,050 6,280 Jun 232 7.4 3S.8 52.3 1,010 3,110 P Lscal year 1937-38 ...... 846 3.8 43.9 67.9 16,000 49,110 ISLAND OF MA.UI 9,

Kailua Stream near Huelo

Location.- Lat. 20°52'35", long. 156°13'25", just upstream from Wailoa ditch intake, It miles southwest of Kailua, and 2J- miles south of Huelo. Drainage area.- 3.0 square miles. Records available.- December 1910 to June 1918, July 1919 to June 1938. Average discharge.- 19 years (1919-38), 18.9 million gallons a day (29.2 second-feet). Extremes.- Maximum discharge, 4,580 million gallons a day (7,090 second-feet) Apr. 7 (gage height, 9.10 feet), from rating curve extended above 150 million gallons a day; minimum, 2.35 million gallons a day (3.64 second-feet) Mar. 1. 1910-18, 1919-38: Maximum discharge, that of Apr. 7, 1938; minimum, 0.07 million gallons a day (0.11 second-foot) June 27, 1921. Remarks.- Records excellent except those for periods of missing gage heights, July 8 to Aug. 11. Dec. 16, May 25 to June 14 (computed on basis of records for six nearby streams) and those above 200 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in millio gallons a day) 1.8 2.35 2.7 29 4.5 253 1.9 3.75 3.0 48 5.0 370 2.0 5.5 3.3 76 6.O 750 2.2 10.2 3.6 109 7.0 1,560 2.4 16.5 4.0 163 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 12.2 230 7.6 5.7 17.1 5.2 13.4 8.4 2.65 4.8 22 33 2 24 200 8.1 9.4 9.0 4.6 9.7 7.2 3.35 6.4 69 50 3 36.5 80 11.6 31.5 5.0 4.1 9.2 48 5.9 23.5 36 20 4 65 20 25 20.5 4.4 3.9 7.0 9.7 40 6.1 18.1 12 5 58 16 10.8 28 13.3 3.75 7.4 36.5 14.5 4.6 10.5 9.5 6 91 13 8.9 7.9 7.6 3.45 5.9 10,7 7.5 537 17.2 8.0 7 38 11 14.7 9.7 32 3.45 23 7.2 4.4 1,140 10.5 15 8 15 22 26.5 15.3 102 3.2 28 6.5 120 268 9.2 30 9 9.0 40 9.7 6.3 48 3.05 35.5 6.1 54 455 53 120 10 7.0 90 7.6 5.5 32.5 3.05 8.1 5.3 18.6 414 117 70 11 9.0 45 23.5 5.0 76 2.9 6.1 5.2 13.4 88 63 15 12 30 24.5 11.9 4.4 16.8 3.05 5.5 5.2 17.3 141 74 13 13 9.0 15.8 7.6 6.1 9 S 30.5 5.0 5.5 58 33 23 10 14 19 35 6.6 5.9 ?!o 104 4.3 7.6 67 47 12.8 45 15 17 175 6.8 4.4 5.9 *42 4.1 4.8 76 49 17.2 24.5 16 16 50 7.2 4.1 5.2 8.9 3.75 4.3 136 68 12.6 19.7 17 40 23,5 5.7 3.75 4.8 *6.6 24.5 4.9 214 22 8.1 12.2 18 13 18.5 5.2 4.1 4.4 5.7 12.6 6.8 244 12.8 7.0 21 19 8.0 11.9 5.2 3.6 4.1 4.5 5.2 4.1 176 9.9 33.5 17.5 20 20 10.8 4.6 4.5 3.75 4.1 4.3 3.5 51 8.1 97 8.9 21 120 9.2 4.3 3.75 58 3.75 4.1 3.45 44 7.2 172 7.2 22 30 7.5 4.3 3.35 71 3.75 3.6 3.: !5 24.5 6.6 36.5 6.1 23 18 47 16.5 3.35 78 69 3.45 3.05 31.5 6.3 59 5.5 24 50 12.5 6.1 8.2 39.5 52 64 3.05 20 5.5 61 5.2 25 45 16,5 8.2 15.9 41 16.2 16.4 2.9 10.8 6.3 30 4.5 26 20 21.5 16.2 5.0 11.1 72 252 2.55 8.6 5.5 150 4.3 27 19 21.5 8.0 3.75 7.5 26 272 2.75 7.4 37 20 16.8 28 11 17.7 5.2 3.45 6.3 14,5 80 2.5 6.3 17.5 25 22.5 29 45 12.5 6.1 4.8 8.1 169 20 5.7 6.8 80 6.5 30' 30 10.8 5.3 14.1 5.9 272 13.5 5.2 5.9 45 5.0 31 150 S.4 5.0 40 12.2 4.6 35

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 150 7.0 34.7 53.7 1,070 3,300 Augi 230 7.6 42.5 65.8 1,320 4,040 Sep 26.5 4.3 9.83 15.2 295 905 Oct 31.5 3.35 8.27 12.8 256 787 HOT 102 3.75 24.5 37.9 735 2,250 Dec 272 2.9 31.9 49.4 988 3,030 C alendar year 192 356 2.9 30.6 47.3 11,170 34,300 Jan 272 3.45 31.1 48.1 964 2,960 Feb 48 2.5 7.91 12.2 221 679 Mar 244 2.65 48.1 74.4 1,490 4,580 Apr ,140 4.6 115 178 3,440 10,570 May 172 7.0 45.9 71.0 1,420 4,370 Jun 120 4.3 21.3 33.0 638 1,960 Fiscal yearl937-!S8 ..... 1 ,140 2.5 35.2 54.5 12,840 39,430 98 ISLAND OF MAUI

Hoolawallllil Stream near Huelo

Location.- Lat. 20°53 I 15", long. 156°14'35", Just upstream from Wailoa ditch Intake, 2 miles west of Kallua, and 2 miles southwest of Huelo. Drainage area.- Not determined. Records available.- April 1911 to June 1938. Average discharge.- 26 years (1911-15, 1916-38), 5.16 million gallons a day (7.98 second- feet)» Extremes.- Maximum discharge during year, 415 million gallons a day (642 second-feet) AprT? (gage height, 4.59 feet), from rating curve extended above 220 million gallons a day; minimum, 1.50 million gallons a day (2.32 second-feet) Feb. 28. 1911-38: Maximum discharge, 657 million gallons a day (1,020 second-feet) Nov. 18, 1930 (gage height, 6.74 feet), from rating curve extended above 220 million gallons a. day; minimum, 0.2 million gallons a day (0.3 second-foot) June 8, 1926. Remarks.- Records good. No diversions. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-3S (gage height, in feet, and discharge, in million gallons a day) 1.4 1.50 1.8 8.7 2.5 1.5 2.7 2.0 15.2 3.0 1.6 4.2 2.2 24.5 3.5

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oet. Nov. Dec. Jan. Peb. liar. Apr. May June

1 1.86 25.5 2.7 1.98 4.1 3.15 7.2 4.0 1.86 2.7 3.45 8.0 2 2.15 30.5 3.0 2.45 3.3 3.0 5.6 3.75 1.74 2.85 8.4 13.8 3 2.7 21.5 3.0 5.5 2.6 2.7 5.0 8.7 2.25 3.45 6.2 7.0 4 3.0 9.3 3.15 5.1 2.45 2.6 4.0 3.75 7.4 2.45 6.4 5.6 5 3.95 6.4 2.7 4.6 3.55 2.45 3.6 5.8 3.15 2.35 4.6 4.8 6 8.1 5.6 2.7 3.0 2.7 2.35 3.3 3.75 2.45 34.5 4.0 4.0 7 4.6 4.6 3.45 5.3 4.2 2.35 3.75 3.45 2.2 119 3.6 4.2 8 3.3 4.8 3.3 6.7 7.1 2.2 6.0 3.3 13.2 14.8 3.65 5.5 9 2.85 6.0 2.7 3.3 4.2 2.1 4.7 3.0 8.2 29 13.5 18.4 10 2.7 10.6 2.6 3.0 4.6 2.1 3.15 2.85 5.4 37.5 21 17.2 11 2.7 7.3 5.3 2.85 13.4 1.86 2.85 2.7 3.9 12.0 12.6 6.2 12 2.85 7.0 3.45 2.6 5.2 2.1 2.7 2.7 4.8 17.4 16.7 5.2 13 2.45 5.4 2.85 3.6 4.2 3.2 2.6 2.85 8.6 8.7 7.2 4.4 14 2.6 7.0 2.6 3.45 3.75 8.8 2.45 2.6 8.3 16.2 5.6 7.0 15 2.45 21.5 2.7 2.7 3.45 6.2 2.35 2.35 7.4 9.5 5.8 5.2 16 2.45 13.6 2.6 2.45 3.15 3.45 2.2 2.35 7.8 23.5 4.4 5.2 17 3.15 8.2 2.45 2.35 2.85 2.85 4.4 3.25 18.4 8.2 3.9 4.4 18 2.7 7.1 2.35 2.35 2.7 2.6 3.0 3.4 22 5.8 3.6 5.4 19 2.35 5.6 2.45 2.35 2.6 2.45 2.45 2.45 17.2 4.8 11.3 4.8 20 3.35 5.0 2.2 2.55 2.45 2.35 2.35 2.2 9.5 4.0 12.1 3.75 21 15.2 4.2 2.1 2.35 8.1 2.2 2.2 2.1 8.7 3.75 30 3.45 22 6.7 3.75 1.98 2.1 7.3 2.35 2.2 2.1 8.4 3.3 10.4 3.15 23 4.6 4.4 3.1 2.1 11.8 10.5 2.2 1.98 7.7 3.3 16.2 3.0 24 7.7 3.6 2.2 4.2 12.0 8.6 5.2 1.98 6.4 2.85 13.6 2.85 25 8.9 3.75 2.45 3.8 13.7 4.6 2.85 1.86 5.0 2.85 S.7 2.6 26 5.8 3.6 3.25 2.6 6.0 6.3 16.5 1.74 4.4 2.7 22.5 2.6 2728 5.4 3.3 2.35 2.35 5.0 5.5 37.5 1.74 3.75 3.35 8.2 2.85 4.4 3.45 2.1 2.35 4.2 5.2 14.8 1.62 3.6 3.3 7.4 4.2 29 6.6 3.15 2.1 2.7 4.0 36 7.0 3.15 2.6 12.2 2.6 30 5.4 3.4 1.98 2.85 3.45 39 6.2 2.85 2.6 11.0 2.45 31 12.6 2.85 2.6 13.6 5.0 2.7 9.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum lie an gallons Aere-feet Jul 15.2 1.86 4.70 7.27 146 447 Aug 30.5 2.85 8.13 12.6 252 773 Sep 5.3 1.98 2.73 4.22 81.9 251 Get 6.7 1.98 3.17 4.90 98.2 301 NOT 13.7 2.45 5.27 8.15 158 485 Dee 39 1.86 6.28 9.72 195 598 C alendar year 193 43 1.74 6.19 9.58 2,260 6,930 Jan 37.5 2.2 5.65 8.74 175 538 Peb 8.7 1.62 3.01 4.66 84.3 259 Har 22 1.74 6.85 10.6 212 652 Apr 119 2.35 13.0 20.1 389 1,190 May 30 3.45 9.91 15.3 307 943 Jun 18.4 2.45 5.66 8.76 170 521 Piaeal year 1937-38 ...... 119 1.62 6.22 9.62 2,270 6,960 ISLAND OF mui 99

Hoolawanui Stream near Huelo

Location.- Lat. 20°53'15", long. 156°14'55", just upstream from intake of Wailoa ditch, 2 miles west of Kallua, and 2 miles southwest of Huelo. Altitude, 1,240 feet. Drainage area.- Not determined. Records available.- December 1910 to June 1938. Average discharge.- 26 years (1911-15, 1916-38), 8.12 million gallons a day (12.6 second-feet). Extremes.- Maximum discharge during year, 1,790 million gallons a day (2,770 second- feet) Apr. 7 (gage height, 4.80 feet), from rating curve based on weir rating between 100 million and 375 million gallons a day and extended above; minimum, 1.66 million gallons a day (2.57 second-feet) Mar. 3. 1910-38: Maximum discharge, that of Apr. 7, 1938; minimum, 0.15 million gallons a day (0.23 second-foot) Oct. 25, 1917. Remarks.- Records good except those above 400 million gallons a day, which are poor. No diversions. Water used for Irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 1.13 0.9 13.5 2.0 135 2.2 1.0 18.3 2.5 255 3.9 1.2 31 3.0 440 6.3 1.4 48 1.7 84 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 2.2 86 3.75 2.55 5.0 4.4 13.1 7.3 2.1 4.4 7.8 15.0 2 3.4 81 4.4 3.05 3.75 3.9 9.9 6.3 2.1 4.8 21.5 19.3 3 6.4 54 4.4 9.3 2.7 3.75 8.5 20.5 2.6 7.3 13.8 11.5 4 9.2 19.4 5.8 6.7 2.55 3.4 6.6 6.6 12.4 4.1 10.3 9.5 5 9.2 13.1 4.1 9.9 4.0 3.2 6.3 12.0 4.6 3.75 7.6 8.2 6 21 10.7 3.9 3.75 3.05 3.05 5.3 6.9 3.05 130 7.6 7.3 7 10.3 8.5 4.9 5.3 7.3 2.7 6.6 5.8 2.55 431 6.3 7.3 8 7.3 8.4 5.6 6.6 23.5 2.55 13.0 5.6 30.5 69 6.6 9.1 9 5.3 12.0 3.9 3.75 8.2 2.55 10.8 5.1 17.7 134 18.8 41 10 4.6 22 3.55 3.4 8.5 2.55 5.3 4.6 7.9 164 44 33 11 4.4 13.7 7.5 3.2 23.5 2.2 4.9 4.1 5.8 41 22.5 12.3 12 8*3 12.4 4.9 2.9 8.5 2.7 4.1 3.9 7.6 59 30 9.5 13 4.4 9.5 3.75 3.9 6.3 10.1 3.75 4.4 18.2 21.5 13.5 7.9 14 5.7 12.5 3.4 3.55 5.3 25.5 3.55 4.1 18.3 32 10.3 14.9 15 4.9 55 3.2 8.9 4.6 11.8 3.2 3.4 17.3 17.8 11.1 11.0 16 4.1 25.5 3.05 8.55 4.1 5.8 3.05 3.05 29 39.5 8.2 11.1 17 5.6 14.1 2.7 2.55 3.75 4.6 7.5 4.3 67 15.4 6.6 8.9 18 4.1 11.5 2.55 2.35 3.4 3.9 4.8 4.8 75 11.5 6.1 10.7 19 3.4 8.9 2.7 o g 3.05 3.55 3.2 3.05 62 9.5 19.2 9.5 20 6.8 7.9 2.2 sll5 2 9 3.2 3.05 2.7 24.5 8.2 29 6.9 21 27 6.6 2.2 2.35 15.5 3.05 2 9 2.55 22 7.3 67 6.1 22 11.9 5.8 2.1 2.2 14.3 3.05 S\7 2.35 17.3 6.3 20.5 5.3 23 8.9 12 2 4.3 S.I 22 19.8 2.7 2.2 16.4 6.1 26.5 5.1 24 13.1 6»3 2.35 4.6 16.5 13.7 11.6 2.2 13.1 5.3 28 4.6 26 13.2 6.6 2.85 5.4 19.4 6.3 4.6 2.1 9.9 5.3 16.6 4.1 26 8.9 6.3 5.0 2.7 9.2 20 60 1.99 8.5 4.9 42 3.9 27 7.9 6.3 3.2 2.35 7.3 9.8 136 1.99 7.3 9.4 15.9 6.0 28 6.3 6.3 2.55 2.55 6.1 7.9 36.5 1.88 6.3 6.9 13.1 8.8 29 13.0 5.3 2.35 3.05 5.8 79 14.0 5.8 4.9 30 4.6 30 9.9 5.1 2.35 3.65 4.9 110 11.1 5.1 4.4 22 3.9 31 50 4.4 2.65 25 8.9 4.9 16.6

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 50 2.2 9.70 15.0 301 923 Augi 86 4.4 18.0 27.9 557 1,710 Sep 7.5 2.1 3.65 5.65 110 336 Oct 9.9 2.1 3.78 5.85 117 360 HOT 23.5 2.55 8.50 13.2 255 782 Dec 110 2.2 13.0 20.1 403 1,240

C alendar year 19! 140 1.99 11.5 17.8 4,210 12,930 Jan 136 2.7 13.5 20.9 418 1,280 Fob 20.5 1.88 4.85 7.50 136 417 Mar 75 2.1 17.0 26.3 527 1,620 Apr 431 3.75 42.3 65.4 1,270 3,890 May 67 6.1 19.3 29.9 599 1,840 Jun 41 3.9 10.5 16.2 316 971 F iscal year 1937- 431 1.88 13.7 21.2 6,010 15,370 100 ISLAND OF MAUI

Honopou Stream near Huelo

Location.- Lat. 20°53'20", long. 156°15'05", Just upstream from Walloa ditch Intake, 2* miles southwest of Huelo and 2i miles west of Kallua. Altitude, about 1,250 feet. Drainage area.- 1.0 square mile. Records available.- December 1910 to June 1938. Average discharge.- 25 years (1911-14, 1916-36 3.23 million gallons a day (5.00 second- feet). Extremes.- Maximum discharge during year, 152 million gallons a day (235 second-feet) Apr. 7 (gage height, 3.23 feet), from rating curve extended above 70 million gallons a day; minimum, 0.70 million gallons a day (1.08 second-feet) Sept. 30, Oct. 1. 1910-38: Maximum discharge, 1,220 million gallons a day (1,890 second-feet) Nov. 18, 1930 (gage height, 7.28 feet), from rating curve extended above 70 million gallons a day; minimum, 0.01 million gallons a day (0.02 second-foot) several days in 1933 and 1934. Remarks.- Records good except those for period of missing gage heights, Aug. 21-25, which were computed on basis of records for stations on nearby streams and are fair, and those above 100 million gallons a day, which are poor. No diversions. Water used for irrigation in central Maul. Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.5 0.65 0.9 5.4 1.7 25 2.6 80 .6 1.45 1.1 9.2 2.0 37 2.9 110 .7 2.55 1.4 16.5 2.3 54

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Apr. 1 1.00 25 1.78 0.77 2.5 2,35 6.9 3.75 1.17 2.35 2 .55 6.2 2 1.35 27 2.0 1.00 1.56 2.0 5.4 3.2 1.08 2.5 6 .9 10.7 3 2.2 22 2.1 3.65 1.08 1.89 5.0 7.3 1.67 3.1 4 .2 5.2 4 1.89 10.4 2.1 2.65 1.17 1.78 3.9 3.1 6.8 1.89 4 .4 4.5 5 2*8 7.1 1.67 2.15 1.98 1.56 3.5 5.1 2.0 1.78 2 ,95 3.75 6 5.4 6.1 1.67 1.17 1.25 1,45 2.95 2.95 1.35 20.5 2 8 3.35 7 2.95 4.8 2.35 3.35 2.65 1.25 3.2 2.7 1.17 88 2 ,45 3.35 8 2.1 4.5 2.0 3.15 4.5 1.35 5.0 2.55 12.0 20.5 2 ,55 4.7 9 1.89 5.4 1.56 1.56 2.55 1.35 3.5 2.45 6.2 29.5 7 .4 14.2 10 1.78 8.1 1.35 1.45 2.6 1.25 2.35 2.2 4.4 41 17 2 13.9 11 1.89 5.9 3.9 1.45 9.6 1.17 2.1 2.1 2.95 16.5 10 5 5.4 12 1.89 5.8 1.78 1.35 3.5 1.56 2.0 2.0 3.6 18.8 13 ,7 4.5 13 1.56 4.4 1.35 2.2 2.8 3.5 1.89 2.35 6.2 10.6 6 .2 3.9 14 1.78 5.7 1.25 2.0 2.55 8.1 1.67 2.0 6.8 16.2 5 .0 6.2 15 1.56 19.6 1.25 1.45 2.35 4.4 1.56 1.67 6.1 9.4 5 ,4 4.0 16 1.45 11.4 1.25 1.25 2.1 2.55 1.45 1.56 6.7 14.3 3 75 3.9 17 2.0 7.3 1.17 1.25 1.89 2.1. 3.9 2.65 16.9 7.7 3 .2 3.5 18 1.56 6.1 1.00 1.25 1.78 1.89 2.05 3.3 18.1 5.9 2 .8 4.4 19 1.35 5.0 1.17 1.17 1.56 1.78 1.45 1.56 16.9 5.0 8 .4 3.2 20 2.95 *3.9 .92 1.62 1.45 1.67 1.25 1.45 10.6 4.4 8 4 2.7 21 12.0 3.5 .84 1.17 6.0 1.56 1.35 1.35 9.2 3.75 22 .5 2.45 22 4.5 3.2 .84 1.08 4.9 1.56 1.17 1.25 8.6 3.1 9 .0 2.2 23 3.2 3.7 1.85 1.00 8.3 9.3 1.25 1.17 6.9 2.8 13 .5 2.1 24 5.7 3.1 .92 2.6 7.4 5.3 3.7 1.17 5.9 2.45 10 .9 2.0 25 6.3 2.8 1.17 1.85 8.8 2.55 1.56 1.17 4.8 2.35 7 .7 1.78 26 3.75 2.55 2.1 1.08 4.4 4.8 14.5 1.08 4.4 2.1 16 .5 1.67 27 3.65 2.35 1.00 1.00 3.65 3.7 31 1.08 3.75 2.55 7 .1 2.35 28 2.95 2.45 .84 1.08 3.1 3.2 14.7 1.00 3.35 2.55 6 .2 3.5 29 4.9 2.1 .77 1.51 2.95 26 6.4 3.1 1.78 11 .2 1.89 30 3.75 2.1 .77 1.25 2.55 33.5 5.6 2.7 1.67 9 .0 1.67 31 10.9 1.89 1.17 12.2 4.5 2.45 8 .2

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 12.0 1.00 3.32 5.14 103 316 Aug 27 1.89 7.27 11.2 225 691 Sep 3.9 .77 1.49 2.31 44.7 137 Oct 3.65 .77 1.63 2,52 50.7 156 NOT 9.6 1.08 3.45 5.34 103 318 Dec 33.5 1.17 4.79 7.41 149 456 Calenaar year 193 41 .77 5.01 7.75 1,830 5,610 Jan 31 1.17 4.73 7.32 147 450 Feb 7.3 1.00 2.33 3.61 65.2 200 Mar 18.1 1.08 6.06 9.38 188 576 Apr 88 1.67 11.5 17.8 345 1,060 May 22.5 2.45 7.82 12.1 243 744 June...... 14.2 1.67 4.44 6.87 133 409 Piscal year 1937- 88 .77 4.92 7.61 1,800 5,610

*Partly estimated. ISLAND OF MAUI 101

Honopou Stream at Lowrie ditch siphon, near Huelo

Location.- Concrete weir control, lat. 20°54'50", long. 156°15'10", half a mile upstream from Government Road and 1.7 miles west of Huelo. Drainage area.- 2.0 square miles. Records at same site obtained by East Maul

Extremes.- Maximum discharge recorded during year, 580 million gallons a day (897 second- reet; Apr. 7 (gage height, 4.20 feet), from rating curve extended above 80 million gal­ lons a day; minimum discharge, 0.08 million gallons a day (0.12 second-foot) July 19. 1932-58: Maximum discharge, 744 million gallons a day (1,150 second-feet), Mar. 21, 1957 (gage height, 4.51 feet), from rating curve extended above 80 million gallons a day; minimum, 0.04 million gallons a day [0.06 second-foot) Oct. 51, 1933. Remarks.- Records good. Discharge for period of missing gage heights, Jan. 6-9, computed from records of stations on this stream above and below Haiku ditch. Wailoa, New Hamakua, and Old Hamakua ditches divert most of flow above this station. Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.1 0.02 0.6 3.75 1.3 30 .2 .16 .7 5.8 1.6 50 .3 .51 .8 8.6 2.0 88 .4 1.15 .9 11.6 2.5 158 .5 2.2 1.0 15.2 3.0 253

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.10 15.4 0.14 0.12 0.12 0.23 0.44 0.26 0.16 0.23 0 .16 0.51 2 .12 18.5 .14 .12 .12 .23 .44 .23 .16 .23 .72 4.3 3 .12 11 '.0 .14 .12 .12 .23 .37 6.4 .20 .23 .23 .37 4 .14 .23 .14 .49 .12 .23 .23 .26 2.85 .16 .26 .30 5 .14 .23 .14 .38 .14 .23 .20 1.40 .26 .16 .20 .30 6 .40 .23 .12 .20 .12 .20 .20 .30 .20 13.5 .20 .26 7 .14 .20 .12 2.85 .16 .16 .40 .26 .23 183 .20 .26 8 .14 .16 .16 .52 .96 .16 .60 .26 1.47 9.4 .20 .26 9 .14 .20 .16 .20 .20 .20 .70 .26 2.85 20.5 2 .9 8.3 10 .12 .26 .12 .16 .16 .23 .20 .26 .34 72 25 .5 10.3 11 .12 .20 .60 .16 1.91 .23 .16 .26 .30 15.5 4 .7 .34 12 .12 .23 .14 .16 .20 .23 .16 .26 .30 24 22 .30 13 .12 .16 .14 .16 .16 .16 .16 .30 .44 2.45 .57 .26 14 .12 .14 .12 .16 .16 .91 .14 .26 .79 11.5 .26 .62 15 .14 27 .14 .16 .12 1.70 .14 .23 .30 2.4 1 ,04 .37 16 .14 6.1 .14 .16 .12 .23 .14 .23 .30 24 .23 .30 17 .12 .37 .14 .14 .12 .20 .14 .61 7.0 1.49 ..23 .26 18 .12 .30 .14 .12 .12 .16 .16 1.70 5.1 .34 .23 .34 19 .10 .26 .14 .12 .14 .16 .16 .26 3.0 .30 4 .3 .30 20 .10 .20 .12 .12 .14 .16 .14 .26 .34 .30 3 .7 .23 21 1.41 .20 .12 .12 .52 .16 .20 .23 .40 .30 28 .23 22 .20 .20 .10 .12 1.68 .16 .20 .20 .34 .30 6 .1 .23 23 .16 .20 .10 .12 .53 1.67 .37 .20 .34 .30 2 .65 .23 24 .23 .20 .12 .12 2.7 1.83 2.6 .20 .34 .26 1 .40 .23 25 .67 .16 .12 .14 8.3 .26 .64 .20 .30 .20 .72 .20 26 .20 .16 .12 .14 .37 2.45 7.7 .20 .30 .16 16 .1 .16 27 .16 .16 .12 .14 .34 .51 28 .20 .30 .16 .70 .20 28 .16 .14 .12 .14 .30 .34 18.2 .16 .23 .16 1 .10 .16 29 .16 .14 .12 .14 .23 30.5 .37 .23 .16 4 .6 .16 30 .16 .14 .12 .14 .23 37 .78 .23 .16 2 .55 .16 31 1.10 .14 .14 3.0 .33 .23 .85

Million gallons a day Seoond- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 1.41 0.10 0.238 0.368 7.37 23 Augi 27 .14 2.68 4.15 83.2 255 Sep .60 .10 .145 .224 4.36 13 Got 2.85 .12 .261 .404 8.08 25 Hov 8.3 .12 .687 1.06 20.6 63 Dec 37 .16 2.71 4.19 84.1 258 C alendar year 193 52 .10 1.88 2.91 687 2,110 Jan 28 .14 2.09 3.23 64.7 198 Fet> 6.4 .16 .566 .876 15.8 49 Mar 7.0 .16 .962 1.49 29.8 92 Apr 183 .16 12.8 19.8 384 1,180 May 28 .16 4.28 6.62 133 407 Jun 10.3 .16 1.01 1.56 30.4 93 F Iscal year 1937- 38 183 .10 2.37 3.67 865 2,660 102 ISLAND OF MAUI

Honopou Stream above Haiku ditch, near Huelo

Location.- Concrete weir control, lat. 20°55'05", long. 156°14'55", 150 feet downstream from Government Road and li miles west of Huelo. Drainage area.- 2.2 square miles. Records available.- July 1932 to June 1938. Records at same site obtained by East Maul irrigation (Jo. November 1926 to June 1932. Extremes.- Maximum discharge during year, 154 million gallons a day (238 second-feet) Apr77 (gage height, 2.31 feet), from rating curve extended above 15 million gallons a day; minimum, 0.26 million gallons a day (0.40 second-foot) July 1. 1952-38: Maximum discharge, 250 million gallons a day (387 second-feet) Dec. 29, 1936 (gage height, 2.76 feet); minimum, 0.08 million gallons a day (0.12 second-foot) DGC. J. t fjj 19o3. Remarks.- Records good. Discharge for days of missing gage heights, Jan. 24, 25, com­ puted on basis of records for stations below Haiku ditch and at Lowrie ditch siphon. Wailoa, New Hamakua, and Old Hamakua ditches divert most of flow above this station Water used for irrigation in central Maul.

Rating table, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) 0.20 0.6 4.0 1.4 40 .59 .8 8.8 1.6 57 1.29 1.0 16.3 1.8 78 2.4 1.2 2.0 104 Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.29 16.3 0.40 0.32 0.72 0.54 1.59 0.69 0.54 0.59 0.54 1.79 2 .45 22.5 .49 .36 .64 .49 1.20 .64 .49 .59 1.38 6.1 3 .99 13.0 .40 .60 .36 .49 1.40 6.5 .65 .64 .81 1.29 4 1.24 2.8 1.14 1.73 .36 .49 .88 .69 5.9 .54 .81 1.11 5 1.44 2.0 .48 1.80 .59 .49 .81 2.6 1.01 .49 .64 .95 6 2.6 .95 .40 .59 .36 .44 .75 .75 .69 12.6 .59 .81 7 1.69 .64 .57 4.7 .53 .44 1.22 .69 .64 97 .54 .81 8 1.04 .69 1.31 2.55 2.6 .40 1.7 .69 1.94 10.2 .49 .88 9 .44 2.0 .44 .75 1.49 .44 1.97 .64 4.0 20.5 6.2 10.9 10 .36 2.65 .40 .49 1.20 .44 .64 5C .88 51 15.7 10.2 11 .32 2.25 1.88 .44 3.7 .40 .59 .64 .75 15.3 6.4 1.05 12 .74 2.25 .69 .40 .91 .44 .59 .73 .75 23 19.1 .88 13 .32 .94 .44 .54 .59 .40 .54 .71 1.39 3.55 1.32 .81 14 .49 2.1 .40 .54 .49 1.98 .49 .64 2.05 10.1 .81 1.50 15 .36 26 .40 .40 .44 4.1 .49 .59 1.29 2.95 1.84 .95 16 .34 7.9 .36 .40 .44 .81 .49 .59 1.39 15.0 .69 .81 17 .60 3.1 .36 .40 .40 .59 .54 .89 8.7 1.69 .69 .75 18 .40 2.95 .36 .36 .40 .54 .75 2.4 7.0 .95 .64 .88 19 .29 1.17 .40 .36 .40 .49 .49 .59 5.0 .81 5.1 .86 20 .57 .75 .32 .36 .40 .44 .44 .59 1.49 .61 3.2 .69 21 3.85 .64 .32 .36 1.27 .44 .44 .54 1.69 .75 28 .64 22 1.69 .59 .32 .36 3.45 .44 .45 .54 1.59 .69 5.0 .64 23 1.20 1.05 .44 .36 2.5 2.6 1.80 .54 1*59 .69 4.6 .59 24 1.55 .76 .36 .40 5.8 4.5 4.0 .54 1.29 .64 2.95 .59 25 2.3 .59 .54 .76 10.7 1.46 1.0 .49 .88 .59 2.2 .54 26 1.16 .58 .40 .44 1.22 5.2 11.6 .49 .81 .59 16.7 .54 27 1.55 1.17 .36 .40 .75 2.7 21 .54 .69 .59 2.0 .54 28 .54 .75 .32 .36 .69 1.6 17.9 .49 .64 .59 2.6 .64 29 1.21 .59 .32 .36 .59 27.5 .92 .59 .54 4.8 .54 30 1.79 .54 .32 .36 59 32.5 1.75 .59 .54 3.7 .54 31 2.25 .49 .40 6.2 .82 .59 2.25

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 3.85 0.29 1.10 1.70 34.1 105 Augi 26 .49 3.89 6.02 121 370 Sep 1.88 .32 .511 .791 15.3 47 Oct 4.7 .32 .724 1.12 22.4 69 HOT 10.7 .36 1.49 2.31 44.6 137 Dec 32.5 .40 3.23 5.00 100 307 C alendar year 193 41 .26 2.53 3.91 922 2,830 Jan 21 .44 2.56 3.96 79.2 243 Fob 6.5 .49 .965 1.49 27.0 83 Mar 8.7 .49 1.85 2.86 57.5 176 Apr 97 .49 9.15 14.2 275 842 May 28 .49 4.59 7.10 142 437 Jun 10.9 .54 1.66 2.57 49.8 153

F iacal year 1937- 97 .29 2.65 4.10 968 2,970 ISLAND OF MAUI 103

Honopou Stream below Haiku ditch, near Huelo

Location.- Concrete weir control, lat. 20°55'05", long. 156°14'50", an eighth of a mile downstream from Government Road, and 1-i miles west of Huelo. Drainage area.- 2.3 square miles. Records available.- July 1932 to June 1938. Records at same site obtained by East Haul Irrigation Co. November 1926 to June 1932. Extremes.- Maximum discharge during year, 278 million gallons a day (430 second-feet) Apr. 7 (gage height, 3.25 feet), from rating curve extended above 39 million gallons a day; minimum, 0.06 million gallons a day (0.09 second-foot) May 6-8. 1932-38: Maximum discharge recorded, 345 million gallons a day (534 second-feet) Dec. 31, 1932 (gage height, 3.43 feet), from rating curve extended above 39 million gallons a day; minimum discharge, 0.02 million gallons a day (o.03 second-foot) Nov. 27, 1933. Remarks.- Records good except those for periods of missing gage heights, Aug. 19-23, May 9-16, June 10, 11, which were computed on basis of records for stations on nearby streams and are poor. Wailoa, New Hamakua, Old Hamakua, and Haiku ditches divert most of flow above this station. Water used for irrigation in central Maui.

Rating table, fiscal year 1937-38 (gage height, In feet, and discharge, in million gallons a day) 0.1 0.02 0.6 4.1 1.5 .2 .22 6.1 2.0 80 .67 8.6 2.5 138 1.41 11.6 3.0 217 .5 2.55 1.0 15.1 3.5 349 Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Har. Apr. Hay June

1 0.67 38.5 0.86 0.80 3.2 0.37 0.41 0.19 0.36 0.92 0.29 15.0 2 1.18 36.5 .92 1.07 !ei .59 .41 .16 .86 .92 21.5 47 3 2.05 30 .92 9.2 .46 .86 .41 15.4 .92 2.2 13.5 4.4 4 6.1 6.7 1.71 3.4 .56 .86 .37 .16 25 .80 3.2 .44 5 7. .9 .46 1.07 11.5 1.24 .86 55 5.7 .76 .80 .08 1.15 6 28 .33 .92 .71 .99 .86 .99 .16 .10 37 .08 1.07 7 7.1 .74 .92 12.5 4.9 .80 1.32 .14 .34 222 .06 1.07 8 1.73 1.41 3.7 12.3 25.5 .86 1.32 .14 17.6 29.5 .49 5.2 9 .67 16.0 .99 .80 4.0 .86 12.5 .14 21.5 62 10 59 10 .56 29.5 .86 .73 9.4 .92 1.07 .12 .22 132 60 58 11 .56 13.4 9.4 .67 31 .86 .99 .12 .22 30 15 1.5 12 1.00 8.2 1.07 .67 2.7 .86 .99 .16 .86 55 50 1.24 13 .61 .67 .86 .67 .61 3.9 .99 .19 34.5 13.9 2.0 1.07 14 .68 4.2 .80 .61 .51 23 .92 .16 36.5 32 1.2 19.5 15 .61 53 .80 .61 .46 21 .92 .51 30.5 15.7 5.0 11.3 16 .51 27.5 .80 .61 .46 .99 .92 .99 30 33 1.1 3.85 17 1.60 7.0 .80 .61 .46 .86 5.9 1.32 44 9.6 .99 1.07 18 .67 10.0 .80 .56 .51 .86 2.8 1.48 27 1.09 »99 10.5 19 .46 2.0 .80 .56 .51 .86 .99 1.32 24.5 1.24 16.9 9.8 20 1.14 1.2 .80 .56 .56 .80 .92 1.24 5.6. 1.24 38.5 .99 21 28.5 1.1 .80 .56 12.3 .80 .86 .99 21.5 1.15 78 .80 22 17.0 1.0 .86 .56 23 .80 .86 .99 11.9 1.15 14.2 .80 23 1.71 1.3 1.70 .56 26.5 6.5 1.15 .99 13.5 1.07 37.5 .73 24 18.2 1.15 1.07 7.3 33 6.8 9.5 .99 5.5 1.07 46 .86 25 39.5 .99 .99 6.8 26 1.60 .22 .92 .10 .99 4.7 .80 26 2.2 1.07 .92 .61 .51 6.4 34.5 .92 .59 .92 65 .73 27 2.35 1.32 .80 .51 .46 1.91 65 .92 .92 2.55 9.3 .92 28 1.07 1.15 .80 .51 .41 1.71 52 .86 .92 .37 6.3 3.3 29 8.0 .92 .80 .51 .37 52 1.12 .92 .29 37.5 .73 30 5.4 .92 .80 .73 .37 53 9.6 .92 .29 28 .80 31 26 .92 .56 .73 2.4 .92 27

Million gallons a day Second- Total run-off Month feet (mean) Hllllon Haxlmm Minimum Mean gallons Acre -feet Jul 39.5 0.46 6.89 10.7 214 656 Aug 53 .33 9.65 14.9 299 918 Sep 9.4 .80 1.31 2.03 39.3 121 Oct 12.5 .51 2.53 3.91 78.4 240 NOT 33 .37 7.05 10.9 212 649 Dec 53 .37 6.26 9.69 194 596 0 alendar year 193 116 .22 7.21 11.2 2,630 8,080 Jan 65 .22 6.87 10.6 213 653 Feb 15.4 .12 1.34 2.07 37.4 115 Hap 44 .10 11.6 17.9 360 1,100 Apr 222 .29 23.0 35.6 691 2,1130 Hay 78 .06 19.2 29.7 594 1,820 Jun 59 .44 8.79 13.6 264 809 Fiscal year 1937- 223 .06 8.75 13.5 3,200 9,800 104 ISLAND OF MAUI

Wailoa ditch, at Honopou, near Huelo

Location.- Lat. 20°53'20", long. 156°15'05", 100 feet downstream from intake from Honopou Stream, half a mile west of Lupi, and 2.2 miles southwest of Huelo. Records available.- November 1922 to June 1938. Average discharge.- 15 years (1923-38), 115 million gallons a day (178 second-feet). Extremes.- Maximum discharge during year, 171 million gallons a day (265 second-feet) Apr. 6 (gage height, 5.S2 feet); minimum discharge recorded, 54 million gallons a day (84 second-feet) Mar. 1. 1922-37: Maximum discharge, 175 million gallons a day (268 second-feet) Nov. 23, 1930 (gage height, 5.77 feet); minimum, 11 million gallons a day (17 second-feet) Feb. 12, 1932. Remarks.- Records excellent except those for period of missing gage heights, May 16 to June 8, which were computed on basis of records for East Maul Irrigation Company's station on Wailoa ditch at Kamole weir and are good. Wailoa ditch receives the water from Koolau ditch at Alo Stream and from all streams from the Alo west to the Halehaku at altitude of about 1,200 feet. Water used for irrigation in central Maul.

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Peb. Mar. Apr. May June

1 105 170 138 142 162 110 162 162 57 110 146 165 2 162 170 146 162 154 102 166 154 61 142 162 165 3 166 170 154 166 110 94 166 162 85 162 166 160 4 166 170 166 166 118 90 154 150 166 126 166 155 5 166 166 162 162 158 83 158 162 162 106 166 145 6 166 166 158 150 146 79 130 158 118 151 166 135 7 162 166 162 154 146 75 158 134 79 170 162 145 8 158 166 162 162 166 72 158 126 130 166 154 155 9 154 166 158 138 166 68 166 122 166 166 162 162 10 146 170 154 122 166 68 154 106 166 166 166 166 11 142 166 166 110 166 64 130 134 162 166 166 166 12 154 166 162 98 166 68 114 130 162 166 170 166 13 142 166 150 154 162 111 106 158 166 170 170 166 14 154 166 138 130 138 170 98 142 166 166 170 166 15 162 166 158 102 122 166 90 114 166 166 166 166 16 162 166 154 90 110 158 87 98 166 170 165 166 17 162 166 126 83 98 122 130 108 170 170 146 166 18 162 166 114 94 90 106 150 134 170 166 130 166 19 158 166 122 90 87 90 106 90 170 166 160 166 20 166 162 106 90 79 83 102 83 166 166 160 166 21 170 162 94 75 139 75 122 79 170 162 165 166 22 166 158 98 72 166 79 90 72 166 158 165 162 23 166 154 154 87 170 162 79 68 166 150 165 154 24 166 158 134 126 170 166 151 68 166 138 165 142 25 166 158 146 160 166 166 162 64 166 138 165 130 26 166 158 126 114 166 166 166 61 166 134 165 118 27 166 154 122 90 162 166 166 61 154 146 165 122 28 166 154 94 90 142 166 166 57 142 162 165 142 29 166 158 114 118 158 166 166 130 146 165 142 30 166 154 114 142 126 166 166 122 126 165 122 31 170 150 114 166 166 110 165

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 170 105 160 248 4,950 15,190 Augi 170 150 163 252 5,050 15,510 Sep 166 94 138 214 4,150 12,740 Oct 166 72 121 187 3,750 11,520 Hov 170 79 142 220 4,280 13,120 Dec 170 64 117 181 3,620 11,120 C alendar year 193 170 64 148 229 54,090 166,000 Jan 166 79 138 214 4,280 13,150 Peb 162 57 113 175 3,160 9,690 Mar 170 57 146 226 4,510 13,850 Apr 170 106 153 237 4,600 14,110 May 170 130 162 251 5,030 15,450 June...... 166 118 154 238 4,610 14,160 Placal year 1937- 170 57 142 220 51,990 159,600 ISLAND OF MAUI 105

New Hamakua ditch at Honopou, near Huelo

Location.- Concrete control, lat. 20°53'30", long. 156°15'10", 15 feet upstream from tun- nei portal, 600 feet downstream from Honopou Stream crossing, and 2.1 miles southwest of Huelo. Records available.- January 1918 to June 1938. Average discharge.- 20 years (1918-58), 29.2 million gallons a day (45.2 second-feet). Extremes.- Maximum discharge during year, 119 million gallons a day (184 second-feet) Apr. 7 (gage height, 5.78 feet); minimum, 0.55 million gallons a day (0.85 second-foot) Jan. 22. 1918-58: Maximum discharge, 143 million gallons a day (221 second-feet) Feb. 27, 1932 (gage height, 5.90 feet); no flow at times, when water was shut out of ditch. Remarks.- Records good except those for period of missing gage heights, Kar. 2-11, which were computed on basis of records for stations on nearby streams and ditches and are poor. Ditch diverts water from streams between the Waikamoi and the Halehaku above Center and Lowrle ditches. Flow regulated by gates and spillways. Water used for Irrigation In central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July " Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 12.6 106 1.52 23 71 1.78 34.5 27 0.87 1.38 63 99 2 69 106 18.6 69 43 1.65 35 16.7 .87 6.7 99 101 3 87 106 24.5 91 1.45 1.31 50 74 6.0 68 95 87 4 91 102 89 83 1.45 1.13 3.35 13.4 90 1.65 91 42 5 91 97 52 80 51 1.18 13.3 71 5.0 .92 54 19.8 6 99 76 20.5 7.8 24.5 1.02 2.0 30 1.20 68 32 3.15 7 91 54 58 26.5 44 1.02 63 4.2 i.oo 109 25.5 21.5 8 80 59 85 65 97 .97 24.5 4.2 100 104 9.8 89 9 33.5 97 35 2.15 89 .92 85 4.6 95 106 91 104 10 2.2 101 5.9 1.65 89 .92 8.4 4.1 10.0 106 102 102 11 13.3 97 69 1.52 99 .82 1.52 5.2 2.5 102 101 87 12 87 97 64 1.31 76 .87 1.38 19.6 49 104 101 54 13 26.5 91 3.2 25 14.2 28 1.25 35 99 99 95 19.8 14 43 95 1.52 12.5 2.0 101 1.13 16.2 97 93 64 89 15 69 106 35.5 1.65 1.72 89 1.08 2.65 97 99 57 89 16 52 102 26 1.38 1.58 27.5 1.08 2.25 99 91 35 89 17 85 99 1.38 1.31 1.45 1.38 32.5 6.8 104 97 2.35 80 18 64 95 1.18 1.25 1.31 1.13 40 28.5 104 83 2.0 89 19 8.4 83 1.58 1.13 1.18 1.02 1.25 2.5 104 50 25.5 87 20 76 57 1.25 1.08 1.08 .92 1.13 2.1 101 22 99 57 21 102 37.5 1.08 1.02 53 .87 1.55 1.93 101 4.3 104 31 22 93 9.0 1.02 .92 97 .87 .97 1.85 99 2.75 101 9.0 23 89 62 57 .92 102 73 1.08 1.31 97 3.6 102 1.72 24 95 47 4.5 24.5 101 95 66 1.08 89 1.93 102 1.58 25 97 80 28 66 99 83 59 1.02 47 9.8 85 1.45 26 89 71 19.7 1.65 62 71 99 .97 17.4 1.72 104 1.31 27 89 89 8.8 1.25 12.0 91 104 .92 5.1 66 99 45 28 54 89 1.02 1.18 2.5 78 104 .82 3.05 68 95 78 29 85 71 16.3 6.1 24 106 91 1.85 1.78 101 7.6 30 91 69 10.5 41 2.0 106 74 1.65 1.18 101 3.3 31 97 12.9 4.2 47 74 1.52 101

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre -feet Jul 102 2.2 69.7 108 2,160 6,630 Aug 106 9.0 79.5 123 2,460 7,560 Sep 89 1.02 24.8 38.4 743 2,280 Oct 91 .92 20.8 32.2 646 1,980 NOT 102 1.08 42.2 65.3 1,270 3,880 Dec 106 .82 32.8 50.7 1,020 3,120 C alendar year 19 2 106 .82 63.3 82.5 19,460 59,710 Jan 104 .97 34.7 53.7 1,080 3,300 Peb 74 .82 13.6 21.0 380 1,170 Mar 104 .87 52.6 81.4 1,630 5,000 Apr 109 .92 52.4 81.1 1,570 4,830 May 104 2.0 75.5 117 2,340 7, ISO Jun 104 1.31 53.0 82.0 1,590 4,880 PIscal year 1937- 109 .8.2 46.2 71.5 16,890 51,810 106 ISLAND OF MAUI

Old Hamakua ditch at Honopou, near Huelo

Location.- Parshall flume, lat. 20°53'30", long. 156°15'05", in Honopou Gulch, 400 feet downstream from Honopou Stream and Wailoa ditch trail crossing, 2.0 miles southwest of Huelo, and 5.0 miles east of Ha lieu. Records available.- January 1918 to June 1922, November 1936 to June 1938. Extremes.- Maximum discharge recorded during fiscal year 1936-37, 38.4 million gallons a day (59.4 second-feet) Mar. 6 (gage height, 2.77 feet); minimum discharge undetermined owing to faulty gage-height record. Maximum discharge during fiscal year 1937-38, 51 million gallons a day (79 second- feet) Apr. 7 (gage height 3.32 feet); minimum undetermined owing to plugged intake. 1918-22, 1936-38: Maximum discharge, 58 million gallons a day (90 second-feet) Jan. 16, 1921 (gage height, 3.25 feet, former site and datum); no flow for short periods. Remarks.- Records good except those for periods of missing gage heights, Nov. 27-30, Dec. 1, 10-22, 29-31, 1936; Mar. 9, 10, 17-31, Apr. 1-26, July 12-15, Nov. 12-18, 1957, which were computed on basis of records of stations for nearby streams and ditches and are pocr. Wailoa and New Hamakua ditches divert most of flow above this station. Water used for irrigation In central Kaui.

Discharge, in million gallons a day, 1936-37 Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.05 0.04 10.4 0.16 0.14 0.04 0.05 0.03 2 .04 .04 7.3 .07 .16 .04 12.0 .03 Z .04 .04 3.2 .05 .09 .04 .06 .04 4 .05 .25 .25 .07 .09 .04 .04 .06 5 .52 .09 .13 .06 2.8 .04 1.84 .08 6 .33 .07 .12 .05 13.5 .04 28 .12 7 .14 .13 .07 6.0 16.2 .04 3.25 1.25 8 .16 .17 .06 .07 4.5 .04 .24 1.49 9 .16 *.41 5.8 .05 6.0 .04 .13 2.0 10 .33 .3 4.7 .04 4.0 .04 .09 1.74 11 .24 .3 .05 .05 2.25 .04 .05 .05 12 .10 .3 .10 .38 10.8 .03 .04 .05 13 .09 .3 5.2 .56 .40 .03 .04 .05 14 .09 .3 2.4 2.6 .09 .03 .05 .04 15 .95 2.0 6.4 2.4 .16 .03 .14 .04 16 .20 2.0 19.2 16.4 .09 .03 3.8 .04 17 8.6 2.0 15.1 11.0 .5 .03 .07 .03 18 4.0 2.0 20.5 22.5 5.0 .03 .05 .03 19 .16 2.0 7.6 8.7 10 .03 3.8 .03 20 .13 2,0 9.8 .53 15 .03 19.7 .02 21 .09 10 .28 .07 15 .03 7.0 .02 22 .06 10 4.7 2.55 4.0 6.0 .16 .02 23 .05 *18.4 2.85 19.0 4.0 6.0 .47 .02 24 .05 9.4 .17 .60 1.0 6.0 .16 .02 25 .05 14.9 .13 1.33 .10 2.0 .09 .02 26 .04 2.25 .12 .05 .10 .5 .09 .03 27 .04 11.8 .12 6.0 .08 .15 .06 .06 28 .04 7.9 .12 4.6 .06 .05 .16 .04 29 .04 30 2.35 _ .04 .05. .17 .04 30 .04 15 3.2 . .04 .10 .04 .04 31 - 15 10.2 - .04 - .04 - ^Discharge partly estimated. ISLAND OF MMJI 107

Discharge, in million gallons a day, of Old Hamalcua ditch at Honopou, near Huelo, Maul, 1936-58 Continued

Day July Aug. Sept. May

.0.04 0.04 0.05 0.17 0.04 0.04 0.05 0.06 0.98 .04 .05 .05 .13 .03 .03 .04 6.0 9.2 .04 .40 .04 .13 .06 .03 .05 .30 .28 .14 .48 .04 .04 .10 .03 3.4 .05 .25 .17 .30 .07 .25 .10 .04 .07 .04 .16 .04 .13 .15 .13 .05 .06 .05 .04 .05 .04 .06 25 .07 .04 .12 .10 .83 .15 .04 .12 .05 39.5 .06 .13 .13 .17 1.20 2.3 .04 2.5 .05 22.5 .05 .24 .53 .06 .05 .05 .03 2.2 .05 26.5 6.5 20.5 6.5 .05 .05 .05 .03 .07 .05 .17 13.0 11.3 15.4 1.54 .79 .04 7.6 .03 .05 .10 3.75 6.3 .17 .81 .13 .04 .60 .04 .05 .09 4.2 .47 .09 .'17 .05 .06 .20 .49 .04 1.00 1.90 .20 .07 2.9 .05 .06 .10 8.3 .04 1.67 1.91 .14 .73 19 »5 .04 .05 .04 1.99 .04 .17 1.18 .17 .26 .07 6.2 .04 .04 .03 .09 .04 5.5 .94 .10 .16 .13 .54 .04 .04 .02 .05 .17 28.5 .49 .07 .13 .09 .28 .04 .04 .02 .04 .11 30 .12 .06 .56 .04 .14 .04 .03 '.02 .04 .05 26 .07 8.0 .17 .16 .09 .04 .03 .02 .03 .04 3.85 .05 11.2 .09 11.7 .07 .04 .04 4.5 .03 2.2 .05 23 .06 .25 .05 .04 .03 1.13 .03 .46 .04 .06 .13 .44 .06 .03 7.9 .23 .04 .05 1.84 .10 .05 .05 3.45 .19 .04 .05 1.36 .12 .05 .17 .13 .12 .03 .05 .17 .10 .06 .05 3.8 .09 .03 24 .05 .16 .19 .06 .04 .30 .09 .05 .36 .05 .10 .19 .04 .04 .18 .10 .07 .06 .35 .13 .25 .12 .04 .04 29.5 .04 .06 .04 10.7 .07 .19 .09 .03 .06 32 .04 .05 .03 6.7 17.3 .05 .05 9.1 .04 .05 1.65

Million gallons a day Second- Total run-off feet Maxlmm Mlnlntiun (mean) sas ^*- November 1936 ...... 0.563 0.871 16.9 52 December...... 5.14 7.95 159 489 Calendar year January'1937 ...... 4.60 7.12 143 438 February...... 3.78 5.85 106 325 March...... 3.75 5.80 116 357 April...... 720 1.11 21.6 66 May...... 2.64 4.08 81.9 251 June...... 251 .388 7.53 The period......

July 1937 ...... 17.3 0.03 1.25 1.93 38.7 119 August...... 32.5 .05 4.21 6.51 130 400 September...... 79 .03 .083 .128 2.49 7.6 October...... 1.20 .03 .143 .221 4.44 14 November...... 7.6 .02 1.13 1.75 33.8 104 December...... 32 .03 3.16 4.89 97.9 301 Calendar year 1937 . 32.5 .02 2.15 3.33 783 2,410 January 1938 ...... 20 .03 1.50 2.32 46.6 143 February...... 07 .03 .048 .074 1.34 4.1 March...... 30 .03 3.96 6.13 123 376 April...... 39.5 .03 4.72 7.30 142 435 May...... 24 .05 4.87 7.54 151 463 June...... 20.5 .04 1.67 2.58 50.2 154 Fiscal year 1937-38 39.5 2.25 3.48 821 2,520 108 ISLAND OF MAUI

Lowrle ditch at Honopou Gulch, near Huelo

Location.- Concrete control, lat. 20°54'55", long. 156°15'05", a quarter of a mile down- stream from siphon across Honopou Stream, 1.6 miles west of Huelo. Records available.- February 1930 to June 1938. January 1910 to March 1927 at site li miles downstream. ), 34.5 million gallons a day (53.4 second-

Extreme s.- Maximum discharge during- year, 76 million gallons a day (113 second-feet) Apr. 7, 10 (gage height, 5.27 feet); no flow Jan. 25. 1930-38: Maximum discharge, 88 million gallons a day (136 second-feet) Har. 21, 1937 (gage height, 5.44 feet); no flow at times. Remarks.- Records excellent except those for periods when clock was not running, July 1 to Aug. 8, Jan. 23-25, May 13 to June 15, which were computed on basis of records for stations on nearby streams and are poor. Lowrle ditch diverts water at altitude of 500 feet from all streams between the Kallua and the Halehaku. Flow regulated by gates. Water used for Irrigation In central Maul.

Discharge, In million gallons, fiscal year July 1937 to Ju

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 20 64 11.5 13.6 51 16.2 51 7.1 9.1 13.8 32.5 55 2 40 64 14.9 35 38.5 14.9 38 6.4 9.1 14.5 56 51 3 52 63 15.1 48 12.3 13.9 51 18.9 13.3 40 56 47 4 55 61 57 54 12.8 13.1 46 7.1 53 38 56 39 5 56 56 43 57 43 12.3 23 19.2 43 16.8 38 33 6 56 43 27 39.5 17.5 11.5 46 6.0 16.8 39.5 40 29 7 54 30 27.5 27.5 33.5 11.0 42 4.9 14.5 61 25 29 8 50 53 57 51 57 10.4 46 5.4 43 38 13.8 57 9 35 57 41 41 57 9.7 48 5.0 53 46 49 58 10 20 60 13.1 24 54 9.7 43 5.5 43 52 58 58 11 45 60 44 15.4 54 8.9 21.5 6.0 38 33 58 51 12 50 60 48 13.6 51 9.3 13.6 6.3 32 43 58 31 13 40 41 31 29.5 43 12.8 12.8 7.3 56 32 53 29 14 30 60 13.6 26.5 25 57 11.8 6.8 56 28 42 56 15 40 66 18.8 14.6 16.2 54 11.3 6.0 56 35.5 28 54 16 47 60 15.9 13.6 15.2 41 10.8 5.6 56 38.5 23 53 17 54 60 11.8 12.3 13.9 25 22 8.2 58 46 19 40 18 40 60 10.6 11.8 9.5 11.0 51 23 58 46 15 50 19 20 48 16.2 11.8 8.9 10.2 28 14.8 58 38 47 *53 20 54 43 11.3 11.3 8.9 9.5 11.3 13.0 56 43 58 24 21 60 32.5 10.0 10.8 33.5 9.1 10.4 12.5 56 32 58 43 22 55 18.8 10.8 10.2 57 8.9 9.5 12.0 56 20.5 58 25.5 23 40 38.5 34.5 10.4 60 42 9.2 25.5 56 20.5 58 15.2 24 60 43 35 18.7 60 58 30 23 53 18.0 58 10.8 25 55 41 25 54 60 48 15 15.0 35.5 16.8 52 10.0 26 50 32.6 17.1 31 51 43 23.5 10.0 28 15.5 58 12.2 27 45 54 17.7 11.5 46 57 29 9.6 20.5 37 56 20 28 40 51 10.0 s-11.0 31 51 8.7 8.9 38 46 55 53 29 55 31 11.4 15.4 23 63 5.4 23 33 58 35.5 30 45 38 14.4 43 18.8 63 6.5 15.5 14.0 58 16.0 31 62 14.4 15.4 60 7.2 14.5 57

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 62 20 46.0 71.2 1,420 4,370 Augi 66 14.4 48.5 75.0 1,500 4,610 Sep 57 10.0 23.8 36.8 714 2,190 Oet 57 10.2 25.2 39.0 782 2,400 NOT 60 8.9 35.4 54.8 1,060 3,260 Dec 63 8.9 27.9 43.2 864 2,650 C alendar year 193 66 6.6 35.5 54.9 12,940 39,760 Jan 51 5.4 25.2 39.0 782 2,400 Fet> 25.5 4.9 10.7 16.6 299 918 Har 58 9.1 60.8 1,220 3,740 Apr 61 13.8 33'.2 51.4 996 3,060 May 58 13.8 46.8 72.4 1,450 4,450 Jun 58 10.0 37.9 58.6 1,140 3,490 F Lscal year 1937- 66 4.9 33.5 51.8 12,230 37,540

Partly estimated. ISLAND OF MAUI 109

Haiku ditch at Kapalalaea Gulch, near Huelo

Location.- Lat. 20°55'25", long. 156°15'35", 3n open section of ditch just downstream from tunnel between Honopou and Kapalalaea Gulches, 2.3 miles northwest of Huelo and 3.4 miles (revised) northwest of Kailua. Records available.- February 1930 to June 1938. January 1910 to October 1914, at site at Peahi weir on Old Haiku ditch. October 1914 to December 1928, at site at Manawai Gulch, 2 miles downstream. 7.5 million gallons a day (42.5 second-

Extremes.- Maximum discharge during year, 171 million gallons a day (265 second-feet) Aug. 1 (gage height, 5.72 feet); minimum, 0.22 million gallons a day (0.34 second-foot) Feb. 19. 1910-28, 1930-38: Maximum discharge, 195 million gallons a day (302 second-feet) Mar. 23, 1937 (gage height, 5.80 feet); no flow occasionally. Remarks.- Records good except those for periods when clock was not running, Oct. 28 to Nov. 9, Dec. 18-30 (computed on basis of records for stations on nearby streams), and those above 50 million gallons a day, which are poor. Haiku ditch diverts water at elevation 250 feet from all streams between Kailua Stream and Maliko Gulch. Flow regulated by gates. Water used for irrigation in central Maul.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.60 115 0.90 0.85 25 2.1 7.7 23 1.10 1.50 10.0 73 2 18.6 108 1.20 5.3 8.0 1.70 5.6 21.5 1.10 1.50 72 90 3 36.5 110 .95 37.5 2.0 1.30 8.5 72 1.71 25 74 34.5 4 75 85 33 15.8 4.0 1.20 4.3 21.5 71 1.90 52 5.2 5 83 25 3.4 58 14 1.10 3.55 69 17.5 1.50 7.9 3.75 6 95 6.0 1.83 5.0 14 1.00 2.6 27.5 3.2 38.5 6.8 3.4 7 73 3.4 2.95 20.5 35 1.00 11.7 19.0 2.5 64 4.5 3.1 8 27.5 2.6 43 47 80 .95 8.4 19.0 49 58 1.50 39.5 9 2.0 74 2.6 5.0 65 1.00 47 17.7 79 62 38 106 10 .85 100 .85 2.0 65 1.00 2.85 17.7 13.6 67 88 91 11 .80 68 39.5 1.80 82 .95 2.25 21.5 12.3 66 91 41 12 29.5 58 7.2 1.60 35.5 1.10 2.0 28 12.3 65 87 11.3 13 2.85 10.5 1.85 2.0 5.6 11.3 1.80 23 87 66 28.5 6.8 14 8.0 64 .95 2.1 1.90 91 1.70 18.2 91 57 8.6 63 15 3.95 108 .85 1.50 1.70 68 1.50 1.50 88 48 5.1 49 16 2.35 100 .85 1.30 1.60 3.75 1.40 .78 90 39.5 2.35 38 17 27 65 .85 1.30 1.50 .94 22 .74 100 65 2.0 7.4 18 6.7 59 .85 1.20 4.5 .90 22 2.85 87 19.9 1.90 34.5 19 1.41 5.9 1.00 1.20 1.65 .87 2.7 .28 88 4.8 12.4 36.5 20 22 2.6 .85 1.10 3.95 .85 1.60 .80 83 3.9 78 8.4 21 102 2.0 .80 1.10 35 .82 1.20 2.5 78 2.85 112 3.2 22 91 1.80 .80 1.00 91 .80 1.03 1.80 78 2.6 81 2.7 23 32 39 18.4 1.00 100 70 9.5 1.80 80 2.35 99 2.35 24 60 7.2 3.2 16.7 104 70 57 1.50 48 2.1 108 7.4 25 80 2.1 2.35 44 99 40 32 1.40 4.1 2.0 49 6.2 26 29.5 6.0 1.00 3.4 10.1 60 67 1.20 2.85 1.90 125 2.5 27 35 11.9 1.00 1.30 4.9 48 135 1.20 2.1 31 70 15.9 28 2.6 5.0 .85 1.30 2.7 40 100 1.00 2.0 16.9 64 46 29 58 1.30 .80 8.5 2.35 100 56 1.80 3.9 66 2.35 30 66 1.76 .75 8.5 2.1 90 52 1.70 2.25 89 6.0 31 82 1.00 2.0 *27.5 48 1.60 75

Million gallons a day Second- Total run-off Month feet (mean) Million H&xdjnuni Minimum Mean gallons Acre-feet Jul 102 0.60 37.2 57.6 1,150 3,540 Aug 115 1.00 40.3 62.4 1,250 3,830 Sep 43 .75 5.85 9.05 175 538 Out 58 .85 9.70 15.0 301 923 Mov 104 1.50 30.1 46.6 903 2,770 Dec 100 .80 23.8 36.8 739 2,270 C alendar year 193 130 .48 31.2 48.3 11,390 34,950 Jan 135 1.03 23.2 35.9 720 2,210 Feb 72 .28 14.9 23.1 418 1,280 Mar 100 1.10 41.2 63.7 1,280 3,920 Apr 11...... 67 1.50 27.5 42.5 824 2,530 May 125 1.50 51.9 80.3 1,610 4,940 Jun 106 2.35 28.0 43.3 840 2,580 Flaoal year 1937-38 ...... 135 .28 28.0 43.3 10,210 31,330

*Partly estimated. 110 ISLAND OF HAWAII

Waiakea Stream at middle flume house, near Mountain View

Location.- Parshall flume and concrete dam control, lat. 19°38'25", long. 155°10'35", at middle flume house, 800 feet upstream from Olaa Sugar Co.'s main flume and 7s miles northwest of Mountain View. Datum raised 0.23 feet Jan. 21, 1938. Records available.- September 1930 to June 1938. Extremes.- Maximum discharge during year, 140 million gallons a day (217 second-feet) Aug. 2 (gage height, 4.65 feet), from rating curve based on weir formulas; minimum, 1.96 million gallons a day (3.03 second-feet) Dec. 22, 23. 1930-38: Maximum discharge, 149 million gallons a day (231 second-feet) July 21, 1931 (gage height, 4.70 feet), from rating curve based on weir formulas; no flow at times, when tunnels and stream dry up. Remarks.- Records excellent except those for period when clock was not running, and Aug. 15-23", and period of construction, Dec. 28 to Jan. 20, which were computed on basis of records for stations on all nearby streams and are poor. No diversions. Large part of flow comes from three tunnels. Water is used for flurning sugarcane.

Rating tables, fiscal year 1937-38 (gage height, in feet, and discharge, in million gallons a day) July 1 to Jan. 20 Jan. 21 to June 30 0.8 1.58 2.2 8.1 3.0 21.5 0.6 2.25 2.0 14.6 1.2 3.15 2.4 9.9 3.2 26.5 .7 2.85 2.5 23.5 1.6 4.9 2.5 11.5 3.5 35.5 .9 4.1 3.0 39 2.0 6.8 2.6 13.2 4.0 58 1.2 6.4 3.5 65 2.1 7.4 2.8 17.1 4.5 115 1.6 9.9

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec, Jan. Peb. Mar. Apr. May June 1 2.85 23.5 4.4 4.2 3.55 12.4 11 25 3.95 8.6 9.3 14.6 2 3.8 53 4.2 6.0 3.55 10.7 10 18.6 3.7 8.1 12.4 #18.6 3 3.35 82 4.0 7.0 3.35 9.4 9.0 16.0 3.45 7.2 13.6 15.3 4 3.35 67 4.0 7.8 3.15 8.9 8.0 13.3 3.15 6.8 14.6 14.6 5 4.9 55 3.8 9.9 3.35 8.1 7.0 10.9 3.15 6.8 14.6 13.3 6 12.7 39 3.55 9.9 4.0 7.4 6.4 9.9 2.85 6.6 15.3 12.1 7 11.8 24 3.85 10.7 5.4 6.8 6.0 8.6 2.6 15.6 14.0 11.5 8 10.7 18.2 4.8 10.7 7.8 6.3 5.6 7.6 3.2 38.5 12.1 10.4 9 11.5 14.2 4.2 10.7 8.2 5.9 5.4 7.2 4.4 32 10.9 9.4 10 11.5 13.2 4.0 9.9 8.1 5.4 5.2 6.4 3.05 35.5 12.2 9.0 11 12.4 12.4 4.7 9.9 8.2 4.9 5.2 10.4 2.95 34 12.5 8.1 12 13.2 10.7 4.2 9.4 7.8 4.2 5.4 10.9 2.8 30.5 9.9 7.6 13 11.5 8.5 4.2 8.5 7.8 4.0 5.0 19.3 3.1 25 9.4 7.2 14 11.5 7.4 4.4 7.8 7.8 4.0 5.0 16.0 5.2 23.5 9.3 6.8 15 11.5 9.0 4.4 6.8 7.4 3.35 5.4 16.8 6.5 20.5 9.4 6.8 16 10.7 8.4 4.0 6.3 7.2 3.15 6.0 16.8 11.9 22.5 9.0 7.2 17 10.7 8.0 4.0 5.9 6.8 2.95 8.0 15.3 20 19.5 8.6 7.6 18 9.9 7.6 3.8 5.4 6.3 2.75 10 13.3 23 16.8 8,1 8.1 19 9.9 7.4 3.55 4.9 5.9 2.55 12 11.5 37.5 16.5 7.2 7.6 20 9.9 7.0 3.35 4.4 5.4 2.35 13 9.9 35.5 14.0 7.2 7.6 21 9.9 6.4 3.15 4.0 5.4 2.2 #11 9.0 35.5 12.1 10.2 7.2 22 9.4 6.0 3.05 3.8 11.3 2.05 8.6 8.1 35.5 10.4 9,8 8.0 23 9.4 7.2 3.15 3.55 14.4 2.4 8-.1 7.2 32 9.4 9.0 7.2 24 9.9 6.8 3.15 3.55 19.0 2.4 8.1 6.4 27.5 8.6 11.5 .2 25 9.4 6.3 2.95 3.9 39.5 2.2 11.5 6.0 23.5 7.6 9.9 .2 26 11.6 6.3 2.7 3.15 34 2.8 24.5 5.4 19.5 8.6 12.1 .2 27 13.1 5.9 4.2 2.95 31 *7.8 22.5 4.8 16.8 8.6 11.3 .8 28 11.5 5.9 3.55 2.95 24 14 37 4.3 14.0 8.1 12.1 .2 29 12.4 5.6 3.35 6.1 18.2 18 44 11.5 8.1 13.3 6.8 30 12.4 5.2 3.35 4.0 15.1 15 37 10.4 8.1 15.3 6.8 31 24 4.9 3.8 13 34 9.4 14.6

Million gallons a day Second- Total run-off Month feet (mean) Million MmH^mtm Minimum Mean gallons Acre -feet Jul 24 2.85 10.3 15.9 321 984 Augi 82 4.9 17.5 27.1 542 1,660 Sep 4.8 2.7 .3.80 5.8S3 114 350 Oct 10.7 2.95 6.38 9.8'r 198 607 Hov 39.5 3.15 11.1 17.2 333 1,020 Dec 18 2.05 6.37 9.8 197 606 C alendar year 1937 82 2.05 12.0 18.6 4,370 13,420 Jan 44 5.0 12.7 19.6 395 1,210 Peb 25 4.3 11.2 17.3 315 966 Mar 37.5 2.6 13.5 20.9 418 1,280 Apr 38.5 6.6 15.9 24.6 478 1,470 May 15.3 7.2 11.2 17.3 349 1,070 Jun 18.6 6.8 9.20 14.2 276 847 P Lscal year 1937-38 82 2.05 10.8 16.7 3,940 12,070

^Partly estimated. ISLAND OF HAWAII 111

Walluku River at Pukamaui, near Hllo Location.- Lat. 19°42'45", long. 155°09'40", three-quarters of a mile upstream from In- La*:e of Hllo Boarding School ditch and 4-|- miles west of Hllo. Drainage area.- 97.2 square miles. Records available.- April 1923 to June 1926', July 1929 to March 1037, January to June 1933. Extremes.- Maximum discharge during period, 4,900 million gallons a day (7,560 second- feet) Jan. 28 (gage height, 13.00 feet), from rating curve extended above 2,000 mil­ lion gallons a day; minimum, 4.3 million gallons a day (6.6 second-feet) Mar. 12. 1923-28, 1929-38: Maximum discharge, 8,980 million gallons a day (revised) (13,000 second-feet) Feb. 17, 1937 (gage height, 16.9 feet, from floodmarks), from rating curve extended above 2,000 million gallons a day; no flow at times when all water was diverted. Revisions.- Revised figures of maximum discharge for the fiscal years 1929-30 to 1936-37, superseding those published in previous water-supply papers, are given herein. Remarks.- Records good except those for period when clock was not running, June 6-15 (computed on basis of records for station above Hilo Boarding School ditch), which are fair, and those for high stages, which are poor. Hilo Water Works diverts water for domestic supply from pool at control. Flow regulated by this diversion.

Revision of figures of maximum discharge, fiscal years 1929-30 to 1936-37

Fiscal Gage-height Discharge Date Million gal­ year (feet) lons a day Second-feet 1929-30 Nov. 18 10.50 2,850 4,410 1930-31* _ _ _ _ 1931-32 July 21 14.95 6,750 10,400 1932-33 Dec. 2 13.90 5,710 8,830 1933-34 Jan. 23 9.18 1,990 3,080 1934-35 Jan. 8 10.50 2,850 4,410 1935-36 July 25 10.20 2,640 4,080 1936-37 Feb. 17 16.9 8,980 13,900 Wage-height record missing, maximum discharge not known.

Rating table, January to June 1938 (gage height, in feet, and discharge, in million gallons a day) 3.0 4.6 3.6 4.5 169 6.0 540 7.5 1,100 3.2 13.3 3.8 5.0 270 6.5 705 8.0 1,350 3.4 26 4.0 5.5 395 7.0 900 9.0 1,880 Discharge, in million gallons, fiscal year July 1937 to June 1958 Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 _ 72 4.6 16.2 39.5 85 2 _ 51 4.6 25.5 11 3 155 3 _ 39.5 6.1 49 16 4 150 4 _ 33 10.2 24.5 13 4 60 5 - 26 26.5 21 75 41 6 _ 22 24 33.5 53 35 7 _ 18.5 8.4 96 4 L 36 8 _ 16.8 6.6 982 3 1.5 37 9 _ 22.5 21 1,800 2 35 10 - 17.4 8.9 413 38.5 52 11 _ 106 7.6 276 53 58 12 _ 213 6.9 178 2 7.5 28 13 _ 786 11.8 157 3 1 25 14 _ 214 60 89 2 3.5 22 15 - 68 72 122 16.8 35 16 . 32.5 143 292 16.8 44 17 _ 27 639 160 1 1.5 81 18 _ 21 443 79 1 3.3 77 19 _ 16.8 1,150 54 1 7.3 37.5 20 - 13.9 340 62 27 31.5 21 _ 11.2 238 37.5 83 32.5 22 _ 9.4 320 31.5 5 3 50 23 _ 8.0 212 27 2 7.5 27 24 _ 6.9 204 22.5 7 1 21 25 34.5 6.1 86 19.8 41 18.5 26 647 5.7 53 24.5 172 21 27 353 5.4 36.5 103 6 25.5 28 1,660 5.0 29 122 9 62 29 859 25.5 77 8 7 25.5 30 213 _ 20.5 48 16<) 18.5 31 107 - 17.9 110

Million gallons a day Second- Total * un-off feet 1 Month (mean) Million Maximum Minimum Mean gallons Acre-feet January 25-31 ...... 1,660 34.5 553 856 3,870 11,890 February...... 786 5.0 67.0 104 1,870 5,750 March...... 1,150 4.6 137 212 4,240 13,000 April...... 1,800 16.2 181 280 5,440 16,700 May...... 172 13.3 62.5 96.7 1,940 5,940 June ...... 155 18.5 47.6 73.6 1,430 4,380 57,660

Peak discharge.- Jan. 28 (11:30 a.m.) 4,900 m.g.d. (7,580 sec. -ft. h Mar. 19 (9:45 a.m .) 2,650 m.g.d. (4,100 sec. -ft.); Apr. 9 (2:45 a.m.) 3,840 m.g.d. (5,940 sec. -ft.). 112 ISLAND OF HAWAII Wailuku River above Hilo Boarding School ditch intake, near Hilo Location.- Lat. 19°42'55", long. 155°09'10", 1,000 feet above intake of Hilo Boarding School ditch, three-quarters of a mile west of reservoir 1, and 4 miles west of Hilo. Drainage area.- 124.5 square miles. Records available.- July 1928 to June 1938. Extrernes.- Maximum discharge during year. 17,750 million gallons a day (27,450 second- feet) Aug. 2 (gage height, 21.70 feet), from rating curve extended above 3,400 million gallons a day; minimum, 8.8 million gallons a day (13.6 second-feet) Jan. 16 or 17. 1928-58: Maximum discharge, 19,000 million gallons a day (29,400 second-feet) Feb. 17, 1937 (gagn height, 22.20 feet), from rating curve extended above 3,400 million gallons a day; minimum, 1.1 million gallons a day (1.7 second-feet) Jan. 9, 1934. Revisions.- Revised figures of maximum discharge for the fiscal years 1928-29 to 1935-36, superseding those published in previous water-supply papers, are given below. Remarks.- Records good except those for periods when clock was not running, Sept. 7-9, 18-20, Sept. 26 to Nov. 14, Dec. 12 to Jan. 19, Feb. 21 to Mar. 17, Mar. 22 to Apr. 11, Apr. 16 to May 15, May 21-25 (computed on basis of records for station at Pukamaui), and those above 4,000 million gallons a day, which are poor. Flow regu­ lated by head gates. Hilo Water Works diverts about 1 million gallons a day for dom­ estic supply from pool at Pukamaui, three-quarters of a mile upstream, and water pass­ ing station is used for power by Hilo Electric Light Go. Dischar ze Discharge Fiscal Gage-height Date Million gal­ Second- Fiscal Date Gage-height Million gal­ year (feet) lons a day feet Year (feet) lons a day feet 1928-29 Feb. 15 17.5 9,100 14, 100 1932-33 Dec. 2 19.35 12,500 19,300 1929-30 Nov. 18 15.07 5,640 8,730 1933-34 Jan. 23 15.50 6,160 9,530 1930-31* 1934-35 Apr. 17 16.78 7,950 12,300 1931-32 July 21 tso.i *14,000 *22,000 1935-36 July 25 15.44 6,090 9,420 *Gage-height record missing; maximum discharge not known tEstimated. Discharge, In million gallons, fiscal year July 1937 to June

Day July Aug. Sept. Oct. Nov. Dec. Jan. F

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 2,580 29 253 391 7,840 24,050 Aug 9,860 34 878 1,360 27,210 83,500 Sep 80 18 38.9 60.2 1,170 3,580 Oct 220 17 74.9 116 2,320 7,130 Nov 1,360 20 221 342 6,620 20,310 Dec 600 10 82.0 127 2,540 7,800 C alendar year 193 9,860 10 331 512 120,600 370,300 Jan 3,800 9 350 542 10,860 33,340 Fob 1,850 17 177 274 4,940 15,170 Mar 3,350 15 372 576 11,540 35,400 Apr 4,300 40 468 724 14,030 43,050 May 470 42 176 272 5,450 16,740 Jun 458 50 132 204 3,960 12,140 PIscal year 1937- 9,860 9 270 418 98,480 302,200

Peak discharge.- Aug. 1 (11:15 a.m.) 17,500 m.g.d. (27,100 sec.-ft.); Aug. 2 (9 n.) 17,750 m.g.d. (27,460 sec.-ft.); Jan, 28 (12 m.) 9.780 m.g.d. (l5,100 sec.-ft.). *Partly estimated. ISLAND OF HAWAII 113

Hilo Boarding School ditch at intake, near Hilo

Location.- Parshall flume; lat. 19°43'00", long. 155°08'55", 200 feet downstream from intake diversion dam on Wailuku River and 3? miles northwest of Hilo. Records available.- October 1931 to June 1938. Extremes.- Maximum sage height during year, 8.35 feet (discharge greater than 21.5 million gallons a day, or 33.3 second-feet) Aug. 2; minimum discharge, 6.6 million gallons a day (10.2 second-feet) Jan. 16, 17. 1931-38: Maximum discharge, beyond measuring capacity of station; no flow when water was shut out of ditch Nov. 23, 24, 1933. Remarks.- Records below maximum capacity of Parshall flume control (21.5 million gallons a day at gage height 2.5 feet) are excellent. Above gage height 2.5 feet control is drowned by overflow from Wailuku River. Water used by Hilo Electric Light Co. for pn,ver.

Dlsehargb, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Hov. Dec. Jan. Feb. Mar. Apr. May June

1 9.2 #21 . 5+ 8.7 10.7 8.7 10.7 9.7 10.7 7.3 9.7 10.2 11.2 2 10.2 *21.5+ 8.7 11.2 8.2 10.2 9.2 10.7 7.3 9.7 11.2 11.8 3 10.2 t20+ 8.7 10.7 8.2 9.7 8.7 10.2 7.8 10.2 11.8 11.8 4 9.7 14.0 8.7 10.2 8.2 9.7 8.7 9.7 8.7 9.7 11.8 11.2 5 9.7 12.9 8.7 10.7 8.7 9.2 8.2 9.7 9.2 9.7 11.2 10.7 6 12.3 12.3 8.2 10.2 9.7 9.2 8.2 9.2 9.2 9.7 10.7 10.2 7 11.8 11.8 8.2 10.2 10.7 9.2 8.3 9.2 8.2 10.7 10.7 10.2 8 12.3 11.2 9.7 11.2 11.2 8.7 8.3 8.7 7.8 t!7.6+ 10.2 10.2 9 11.2 11.2 8.7 10.2 10.7 8.7 8.3 9.2 9.2 t20+ 10.2 10.2 10 10.7 11.2 8.2 9.7 11.2 8.7 7.8 8.7 8.2 13.4 10.2 10.7 11 10.7 13.4 9.2 9.7 11.2 8.7 7.8 10.7 7.8 12.9 10.7 10.7 12 11.2 11.8 10.2 9.2 10.7 8.2 7.3 11.8 7.8 12.3 10.2 10.2 13 10.7 11.2 9.2 8.7 10.2 8.2 7.3 tie. 4+ 8.7 12.3 9.7 9.7 14 10.7 10.7 8.7 8.7 9.7 8.7 7.3 12.3 10.2 11.8 9.7 9.7 15 10.2 11.2 9.2 8.7 9.7 8.2 6.9 11.2 10.7 11.8 9.7 10.2 16 10.2 11.2 8.7 8.7 9.2 .8 6.9 10.7 11.2 12.3 9.2 10.7 17 10.2 10.7 8.2 9.2 8.7 .8 6.9 10.2 tie. 4+ 11.8 9.2 11.2 18 10.2 10.2 8.2 8.7 8.7 .8 6.9 9.7 14.0 11.2 9.2 11.2 19 10.2 10.2 8.2 8.7 8.7 .8 7.3 9.2 t!8.8+ 10.7 9.2 10.2 20 10.2 10.2 8.2 8.2 8.2 .3 til. 8+ 8.7 13.4 10.7 9.7 10.2 21 10.2 9.7 8.2 8.2 8.2 .3 11.8 8.2 12.9 10.7 11.2 10.2 22 10.2 9.2 7.8 8.2 10.7 .8 11.3 8.2 13.4 10.2 10.7 10.2 23 10.2 9.2 8.7 7.8 15.1 .8 10.3 7.8 12.9 9.7 10.2 9.7 24 10.2 9.7 8.7 8.2 12.9 9.2 9.7 7.8 12.3 9.7 11.2 9.2 25 10.2 9.2 8.2 9.7 9.2 10.3 7.8 11.8 9.2 10.7 9.2 26 11.2 8.7 8.2 8.7 11.8 9.7 7.8 11.2 9.7 12.3 9.7 27 11.8 8.7 8.7 8.2 11.2 t!2.3+ is!4 7.3 10.7 11.2 11.2 9.7 28 10.7 9.2 9.7 7.8 11.2 12.3 t!8.8+ 7.3 10.2 11.2 11.2 10.7 29 10.7 8.7 9.2 10.7 10.7 11.2 t!7.6+ 10.2 11.2 11.2 9.7 30 10.7 8.7 9.7 9.7 10.7 10.7 12.3 9.7 10.7 11.8 9.2 31 tie. 4+ 8.7 9.2 10.2 11.2 9.7 11.8

Million gallons a day Second- Total r un-off Month feet (mean) Million Maximum Minimum He an gallons Acre-feet Jul 16.4+ 9.2 10.8 16.7 334 1,030 Augi 21.5+ 8.7 11.6 17.9 358 1,100 Sep 10.2 7.8 8.72 13.5 262 803 Oct 11.2 7.8 9.35 14.5 290 890 NOT 15.1+ 8.2 10.3 15.9 308 946 Dec 12.3+ 7.3 9.10 14.1 282 866 C alendar year 193 21.5+ 6.9 10.2 15.8 3,740 11,490 Jan 18.8+ 6.9 9.77 15.1 303 930 Feb 16.4+ 7.3 9.61 14.9 269 826 Mar 18.8+ 7.3 10.5 16.2 327 1,000 Apr 11...... 20+ 9.2 11.4 17.6 342 1,050 May 12.3 9.2 10.6 16.4 328 1,010 Jun 11.8 9.2 10.3 15.9 310 950 FIscal year 1937-38 ...... 21.5+ 6.9 10.2 15.8 3,710 11,400 *Control drowned by overflow from Wailuku River for e ntlre day. tControl drowned by overflow from Wailuku River for f art of day. 114 ISLAMD OF HAWAII

Kapehu ditch near Hilo

Location.- Soil Conservation Service type H (De Fabritis) flume, lat. 19°43'40", long. 155"11'00", 0.9 mile downstream from intake, 3 miles west of Piihonua, and 6 miles west of Hilo. Records available.- March to June 1938. Extremes.- Maximum discharge during period, 10.4 million gallons a day (16.1 second-feet) Apr. 9 (gage height, 2.38 feet); minimum, 0.01 million gallons a day (0.02 second- foot) Mar. 30. Remarks.- Records excellent except those for periods when clock was not running, May 13-16, June 25-30, which were computed on basis of records for stations on nearby streams and are fair. Water used to supplement the municipal supply of Hilo during dry periods.

Discharge, in million gallons, fiscal year Jolly 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. liar. Apr. May June 1 2.5 2.5 2.7 2 2.5 2.65 2.9 3 2.6 2.85 2.7 4 2.5 2.6 2.6 5 2.5 2.5 2.5 6 2.5 2.5 2.5 7 2.75 2.45 2.5 8 3.9 2.4 3.2 9 6.5 2.65 3.75 10 4.3 2.95 3.5 11 4.3 2.9 3.0 12 3.75 2.85 3.0 13 3.5 2.9 3.0 14 1.04 2.05 2.9 3.0 15 2.15 1.14 2.9 3.0 16 2.6 1.23 2.95 3.0 17 3.5 .83 3.05 3.25 18 3.15 1.52 3.5 3.25 19 5.9 .61 3.5 3.0 20 3.25 1.07 3.5 3.0 21 2.85 2.65 3.25 3.0 22 3.5 2.65 2.85 2.95 23 2.9 2.65 2.85 2.9 24 2.75 2.65 2.9 2.9 25 2.6 2.6 2.85 2.7 26 2.5 2.6 3.0 2.7 27 2.4 2.65 2.8 3.1 28 1.41 2.6 2.75 2.8 29 .04 2.55 2.85 2.7 30 1.00 2.5 2.9 2.7 31 2.5 2.8

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul Aug Sep Oot Hov Dec 0 alendar year Jan Feb Mar oh 14-31 5.9 0.04 2.56 3.96 46.0 141 Apr H 6.5 .61 2.62 4.05 78.6 241 May 3.5 2.4 2.86 4.43 88.8 273 Jun 3.75 2.5 4.53 87.8 269 Tlle perio 924 ISLAND OF HAWAII 115

Awini ditch at East Honokaneiki Gulch, near Niulii

Location.- Lat. 20°09'55", long. 155°43'10", at flume across East Honokaneiki Gulch, 4i miles southeast of Niulii. Records available.- October 1927 to June 1938. Average discharge.- 10 years (1928-38), 11.8 million gallons a day (18.3 second-feet). Extremes.- Maximum discharge during year not determined owing to faulty gage-height rec- ord; no flow at times. 1927-38: Maximum discharge, 34 million gallons a day (53 second-feet) Jan. 9, 1935 (gage height, 3.76 feet); no flow at times when ditch was dry or. water was turned out. Remarks.- Records poor. Discharge for periods of faulty gage heights, Jan. 11 to Feb. 8, 10, 11, Apr. 14, 15, 28, 29, May 5, 6, May 29 to June 30, computed on basis of records for stations on all nearby streams. Awini ditch diverts water at altitude 2,000 feet from all streams between the Waikaloa and the Honokane. Flow regulated by head gates and spillways. Water used for Irrigation in vicinity of Kohala.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 11.2 29 13.9 2.9 1.61 0 V.2 IV 0.15 V.O 14.3 13 2 16. V 29 16.9 3.0 1.21 0 5.3 12 .08 13.2 16.9 12 3 18.9 29 19.2 6.1 .84 0 4.1 19 .62 20 3.9 11 4 22 2V 19.6 7.0 .40 0 4*1 14 7.0 21 3.2 9.6 5 21 25 13.2 11.3 .22 0 13.4 17 6.0 15.4 3.1 8.7 6 21 25 13.9 4.3 .22 1.24 9.0 11 1.97 18.4 3.0 8.0 7 24 25 22 14.2 .17 1.25 16.6 10 .69 24 »5.9 9.0 8 17.6 2V 20 11.2 1.13 1.16 #11.2 11 2.V 13.2 11.8 15 9 11.8 31 18.4 *11.2 6.2 .98 8.2 #19 10.0 13.2 11.2 14 10 10.6 33 13.6 8.7 V.2 .90 *6.6 14 V.3 14.6 20.5 12 11 11.2 31 23.5 6.9 8.V .83 6.0 12 V.5 20 25 11 12 24.5 29 17.6 6.0 4.5 .69 6.0 *9.3 5.8 23.5 18.4 9.5 13 21 «31 16.2 5.V 1.14 .69 5.0 10.6 4.2 22 #16.2 9.5 14 16.9 «31 13.0 5.V .32 12.8 4.5 11.2 5.0 IV. 6 »11.2 16 15 21 27 16.9 5.4 .35 6.6 3.9 8* 2 V.6 17.5 9.3 18 16 15.4 23.5 9.9 4.5 .26 12.2 3.7 81.5 9.3 *15.0 7.6 16 17 11.8 22 8.2 4.6 .15 7.0 3.V 83.5 9.3 13.5 V.O 14 18 14.6 18.4 V.4 4.3 .10 5.4 4.1 82 8.V 13.2 6.5 13 19 16.2 15.4 23.5 3.65 .0V 2.95 3.8 V.3 10.1 13.2 6.0 11 20 #23.5 5.6 14.6 3.3 .06 2.2 3.7 2.1 28 13.9 8.V 9.2 21 *15.4 3.35 13.2 3.0 3.2 1.8V 3.V .86 11.0 13.0 20 8.8 22 11.2 2 9 7.9 2.75 16.2 8.4 4.5 .46 5.0 20 17.6 8.6 23 11.2 3.0 6.0 2.55 16.2 6.1 4.0 .30 5.5 20 20 8.4 24 12.5 2.55 6.0 2.6 6.8 10.6 18 .22 3.35 15.4 22 8.0 25 15.4 2.1 5.2 2.75 .04 9 3 16 .19 2.7 16.0 18.4 V.8 26 15.4 2.45 5.2 1.54 0 8.2 17 .10 1.66 IV. 0 18.4 V.6 27 13.9 14.6 5.2 .28 0 5.6 16 .06 1.66 21 17.6 8.0 28 11.8 21 5.1 4.5 0 11.5 18 .12 1.50 20 #16.9 15 29 9.9 20 5.4 11.2 0 21.5 15 V.I 21 17 13 30 9.9 16.9 4.5 6.4 0 16.2 12 8.2 *15 18 8.0 31 23 14.6 2.9 11.8 13 V.6 15

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 24.5 9.9 16.1 24.9 500 1,540 Aug 33 2.1 19.9 30>.8 617 1,890 Sep 23.5 4.5 12.8 19.8 385 1,180 Oct 14.2 .28 5.50 8.51 1VO 523 NOT 16.2 0 2.58 3.99 77.3 237 Dec 21.5 0 5.42 8.39 168 515 C alendar year 193 33 0 10.8 16.7 3,950 12, 120 Jan 18 3.7 8.62 13.3 267 820 Feb 23.5 .06 9.79 15.1 2V4 841 Mar 28 .08 6.04 9.35 18V 5V5 Apr 24 V.O 16.9 26.1 508 1,560 May 25 3.0 13.2 20.4 411 1,260 Jun 18 7.6 11.1 17.2 333 1,020 Fiscal year 1937- 33 0 10.7 16.6 3,900 11,960 Wartly estimated. 116 ISLAND OF HAWAII

East Honokaneiki intake to Awini ditch at East Honokanelki Gulch, near Niulii

Location.- Sharp-crested weir, lat. 20°09'55", long. 155°43'15", on intake tunnel de- livering water from East Honokanelkl Gulch to Awini ditch, on west side of gulch, 4i miles southeast of Niulii. Records available.- October 1927 to June 1938. Extremes.- Not determined owing to faulty gage-height record. ISS7-38: Maximum discharge, 10.8 million gallons a day (16.7 second-feet) Mar. 27, Apr. 2, 1930 (gage height, 1.35 feet); no flow occasionally. Remarks.- Records poor. Discharge for periods of missing and faulty gage heights, July 1, 2, July 21 to Aug. 31, Sept. 20 to Oct. 17, 23, Nov. 9-12, Nov. 15 to Dec. 6, Dec. 9 to Jan. 18, Jan. 27 to Feb. 8, 12, 23-25, 28, Mar. 1, Mar. 12 to Apr. 22, May 3 to June 30, computed on basis of records for station on Awini ditch at East Honokaneiki Gulch. Intake diverts water from East Honokaneiki Gulch to Awini ditch for irriga­ tion in vicinity of Kohala. Flow regulated by headgates.

Discharge, in million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 0.20 5.6 0.09 0.17 0.41 0.35 2.5 2.4 0.25 2.8 1.46 1.5 2 2.0 5.0 0 .35 .48 .30 .90 .70 ».51 5.0 4.0 1.0 3 1.38 4.4 .34 .25 .41 .20 .13 3.0 .95 7.0 3.2 .70 4 .83 3.9 2.45 1.2 .22 .15 .13 1.3 1.38 7.5 2.3 .50 5 2.35 3.2 1.85 6.0 .18 .10 4.0 1.4 .66 6.0 .30 .30 6 3.15 3.2 1.60 1.5 .12 .20 3.0 .50 .38 6.5 .27 .25 7 4.0 3.4 1.90 5.5 .10 .29 5.4 .25 .20 8.0 .25 1.0 8 1.86 3.7 2.7 5.0 ».10 .18 2.2 .20 1.06 6.0 .40 2.5 9 .58 4.8 3.1 1.1 2.2 .17 1.4 1.56 2.95 3.0 .50 3.2 10 .48 6.0 3.4 .80 2.5 .17 1.0 1.38 3.85 3.3 2.0 2.5 11 .48 5.0 5.0 .58 3.0 .14 .90 1.33 2.9 3.2 7.0 .80 12 4.7 3.1 4.4 .41 1.7 .17 .90 .70 3.1 3.1 5.0 .50 13 2.3 4.8 3.6 .50 .08 .50 .50 1.51 1.0 3.1 3.5 .50 14 2.1 6.4 3.0 .80 .08 1.4 .35 1.56 1.2 4.5 2.0 4.0 15 2.2 6.0 1.24 .56 .10 3.5 .10 1.46 3.2 4.5 2.0 5.0 16 .95 3.4 .41 .35 .10 1.7 .10 .83 3.6 3.5 1.4 4.0 17 .75 3.0 .32 ..35 .16 3.0 .40 1.60 3.6 3.1 .90 3.0 18 .95 2.5 .32 .26 .10 .90 1.3 1.03 3.4 3.1 .70 2.0 19 1.24 2.1 3.8 .18 .12 .40 ».32 1.28 3.8 3.1 .50 1.3 20 2.9 1.9 1.0 .16 .06 .20 .35 1.24 8.0 3.2 .35 .90 21 2.2 1.8 .66 .14 .15 .13 .38 .95 1.2 3.0 6.0 .80 22 1.2 1.8 .45 .12 5.0 2.5 .38 .75 .80 4.5 7.0 .70 23 1.3 1.8 .35 .12 5.2 1.4 .35 .18 .80 2.95 6.0 .60 24 1.5 1.8 .35 .41 2.0 3.2 2.8 .10 .50 1.72 7.0 .50 25 3.0 1.8 .25 .44 1.5 2.8 3.85 .18 .40 .83 5.0 .40 26 3.0 1.7 .20 .44 .90 2.5 2.25 ».41 .35 2.05 5.0 .35 27 2.4 1.8 .20 .41 .90 1.0 1.7 ».26 .35 5.6 4.0 1.0 28 2.8 2.5 .19 .99 .80 3.5 3.5 .80 .30 4.0 3.5 3.2 29 3.4 2.6 .22 3.4 .90 8.0 1.5 2.8 2.8 3.7 1.5 30 3.0 2.2 .17 .44 .60 6.0 1.1 3.2 2.1 3.9 .80 31 6.0 1.7 .29 4.5 1.2 3.0 2.0

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 6.0 0.20 2.10 3.25 65.2 200 Augi 6.4 1.7 3.32 5.14 103 316 Sep 5.0 0 1.45 2.24 43.6 134 Oct 6.0 .12 1.07 1.66 33.2 102 HOT 5.2 .06 .883 1.37 26.5 81 Dec 8.0 .10 1.60 2.48 49.6 152 C alendar year

Jan 5.4 .10 1.45 2.24 44.9 138 Feti 3.0 .10 1.03 1.59 28.9 89 Mar 8.0 .20 1.93 2.99 59.7 183 Apr 11...... 8.0 .83 3.97 6.14 119 365 May 7.0 .25 2.94 4.55 91.1 280 Jun 5.0 .25 1.51 2.34 45.3 139 P Iscal year 1937- 8.0 0 1.94 3.00 710 2,180 *Fartly estimated. ISLAND OF HAWAII 117

Kohala ditch at Pololu, near Nlulll

Location.- Lat. 20°10'20", long. 155°44'15", on open section of ditch in Pololu Valley Just downstream from boundary between land of Honokane and land of Pololu, 2-f miles upstream from mouth of Pololu Stream, and 4 miles south of Niulii. Records available.- August 1927 to June 1938. Extremes.- Maximum discharge recorded during year, 69 million gallons a day (107 second- feet) Nov. 23 (gage height, 4.03 feet); no flow several days, when water was shut out of ditch. 1927-38: Maximum discharge, 76 million gallons a day (118 second-feet) Dec. 2, 1932 (gage height, 4.33 feet); no flow occasionally, when water was shut out of ditch. Remarks.- Records good except those for period of lost record, May 28 to June 30, which were computed on basis of records for stations on all nearby ditches and streams and are poor. Flow regulated by head gates. Kohala ditch receives flow of Awlnl ditch and diverts at altitude of about 1,200 feet from all streams west of the Honokane. Water Is used for irrigation In vicinity of Kohala.

Discharge, In million gallons, fiscal year July 1937 to Ju

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 30 39 23 23 23 16.5 23 26 21 22 27 30 2 43 36.5 24 22 21 13.8 20 25 19.2 26 34.5 29 3 36 29 29 26 19.2 13.0 20 24 23 36.5 29 26 4 32.5 32.5 39 25 18.3 13.0 20 26 34.5 34.5 24 23 5 43 34.5 30 39 17.4 13.0 31 30 31 32.5 15.6 21 6 43 34.5 27 27 17.4 15.6 27.5 27 23 29 14.1 20 7 43 34.5 32.5 34.5 17.4 18.3 43 23 21 41 13.8 22 8 41 36.5 36.5 41 18.3 18.3 28 24 25 30 19.2 34 9 31 41 34.5 28 30 17.4 39 32.5 36.5 21.5 23 33 10 27 43 29 23 34.5 17.4 28 25 36.5 24.5 34.5 30 11 27 33 36.5 21 39 16.5 25 22 34.5 24 46 27 12 43 32 32.5 20 32.5 17.4 25 21 34.5 23.5 36.5 23 13 41 53 30 20 22 17.4 22 20 31 23.5 32.5 23 14 34.5 41 28 20 18.3 48 20 23 34.5 27 27 40 15 *41 31 30 19.2 17.4 30 19.2 20 39 27 27 42 16 *34.5 41 24 18.3 16.5 41 18.3 21 36.5 25 24 42 17 28 29 22 18.3 16.5 30 18.3 27 36.5 23 22 40 18 30 29 22 18.3 15.6 26 20 28 39 25 21 36 19 31 30 32.5 17.4 15.6 22 19.2 28 32.5 25 20 29 20 43 21 28 16.5 15.6 20 18.3 23 *34.5 27 19.2 24 21 43 16.5 26 16.5 18.1 19.2 17.4 22 34.5 24 39 23 22 34.5 15.6 24 16.5 58 31 18.3 20 36.5 29 46 22 23 34.5 25 22 15.6 60 27 14.2 19.2 32.5 31 43 21 24 39 21 21 16.5 47 32.5 25 18.3 30 27 48 20 25 43 18.3 20 30 19.2 27 8.6 18.3 19.2 28 41 19.5 26 43 21 20 25 15.6 21 33 22 16.5 30 43 19.0 27 41 29 19.2 19.2 15.6 22 18.2 22 13.8 34.5 39 25 28 36.5 32.5 19.2 18.3 19.2 28 32.5 24 13.0 32.5 36 35 29 43 27 22 53 20 41 29 19.2 34.5 36 28 30 43 26 23 36.5 18.3 36.5 27 23 28 37 20 31 46 25 26 29 26 22 34

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minljuum Mean gallons Acre-feet Jul 46 27 37.7 58.3 1,170 3,590 Augi 53 15.6 30.9 47.8 958 2,940 Sep 39 19.2 26.9 41.6 806 2,470 Oot 53 15.6 24.2 37.4 751 2,300 HOT 60 15.6 23.9 37.0 716 2,200 Dec 48 13.0 23.8 36.8 739 2,270 C alendar year 193 60 1.4 28.0 43.3 10,230 31,370 Jan 43 8.6 23.7 36.7 734 2,250 Peb 32.5 18.3 23.6 36.5 661 2,030 Mar 39 13.0 28.5 44.1 883 2,710 Apr 41 21.5 28.2 43.6 846 2,600 May 48 13.8 30.7 47.5 952 2,920 Jun 42 19.0 27.6 42.7 826 2,540 Piscal year 1937- 60 8.6 27.5 42.5 10,040 30,820 118 ISLAND OF HAWAII

Kehena ditch near Kohala

Location.- Three sharp-crested weirs, lat. EO°07'E5", long. 155°45'05", at old Honokane weir, near head of West Branch of Honokanenui Gulch, 8f miles southeast of Kohala. Records available.- December 1917 to November 1919, April 1928 to June 1938. Extremes.- rfeximum discharge during year, 43 million gallons a day (66 second-feet) Jan. 26 (gage height, 1.15 feet); no flow occasionally, when water was shut out of ditch. 1917-19, 1928-38: Maximum discharge, 86 million gallons a day (133 second-feet) Jan. 27, 1918 (gage height, 2.16 feet, former datum); no flow during dry periods. Remarks.- Records good. Discharge for periods of missing gage heights, Oct. 20, 21, Dec. 5-7, computed on basis of records for stations on all nearby ditches and streams. Flow regulated by several gates above station. Intake on Honokanenui Stream 2 miles upstream from station, at altitude of about 4,200 feet. No diversions. Water used for Irrigation In vicinity of Hawi.

Discharge, In million gallons, fiscal year July 1937 to June 1938

Day July Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June

1 2.3 7.1 1.12 0.30 2.45 0.61 1.90 11.7 10.8 0.84 8.6 5.6 2 21 5.6 3.25 .72 2.1 .02 1.12 4.1 4.1 6.7 17.9 5.2 3 11.1 3.45 5.8 .52 1.26 0 .72 18.6 4.3 21 16.8 3.05 4 10.3 7.4 17.8 2.6 .84 .27 .61 7.0 18.4 13.8 13.2 1.73 5 20 4.9 5.0 16.2 .61 .31 2.85 7.3 9.6 5.0 5.9 1.12 6 24.5 4.1 3.25 3.3 .84 .35 6.1 3.7 3.25 4.0 3.45 .84 7 23 5.6 10.0 8.6 .61 .40 17.1 2.1 2.25 27.5 2.45 9.11.41 ' 8 15.4 15.3 18.7 16.9 1.27 .40 3.45 1.73 5.6 17.8 1.73 9 3.7 18.2 10.7 3.1 8.6 .40 18.4 4.7 25.5 13.5 1.57 8.6 10 2.25 7.0 4.4 1.41 14.7 2.4 3.3 2.45 23 13.2 13.9 5.2 11 10.0 5.1 15.2 1.12 19.1 .98 1.73 1.57 22.5 13.2 16.2 3.6 12 28.5 4.9 6.3 .84 8.7 1.08 1.57 1.12 11.4 13.2 9.0 1.57 13 13.1 5.1 4.4 .61 2.25 1.94 .98 1.12 6.8 12.1 7.5 1.54 14 3.75 5.4 5.4 1.41 1.12 23.5 .72 1.73 12.8 5.4 2.45 23 ..5 15 14.2 5.4 8.7 .98 .72 6.2 .50 1.41 27.5 4.4 4.8 27.5 16 7.8 5.4 2.25 .61 .50 13.1 .40 1.12 31.5 3.25 2.1 27 17 4.4 5.9 1.12 .61 .30 4.2 1.12 9.5 24 2.1 1.26 22.5 18 6.2 3.45 .84 .40 .20 2.1 2.25 6.7 12.5 1.57 .84 13.2 19 5.1 2.25 7.4 .30 .10 1.26 1.57 3.3 8.9 1.26 .72 4.9 ,20 24 1.41 1.20 «.14 0 .84 .98 1.41 8.3 1.12 .61 2.65 21 13.6 .10 .72 «.36 4.2 .61 .72 .84 11.4 1.12 8.6 1.73 22 4.9 0 1.12 .84 32 5.8 .72 .72 15.3 7.2 15.4 1.73 23 6.0 0 .98 .61 33 5.5 .61 .50 15.3 16.6 15.0 1.12 24 15.2 1.74 .98 2.0 23.5 9.2 16.6 .40 14.6 9.5 27 .98 25 16.6 1.73 .28 6.9 9.8 3.7 30 .50 3.7 4.9 7.9 .72 26 11.4 6.0 .25 2.25 4.2 1.90 23.5 13.4 2.65 15.7 1.12 .61 27 8.6 8.9 .40 .98 0 1.73 16.8 11.5 2.25 34.5 9.4 2.25 28 4.8 5.6 .40 1.40 2.05 4.9 21.5 15.8 1.73 32 12.8 11.2 29 19.4 3.45 .40 28.5 2.85 21 13.5 1.26 18.4 13.2 2.65 30 17.0 2.25 .30 9.2 1.90 9.9 5.6 .98 9.2 14.6 1.57 31 12.6 1.41 2.85 3.9 5.3 .84 10.3

Million gallons a day Second- Total run-off Month feet (mean) Million Maximum Minimum Mean gallons Acre-feet Jul 28.5 2.25 12.3 19.0 381 1,170 Augi 18.2 0 4.97 7.69 154 473 Sep 18.7 .25 4.62 7.15 139 426 Oct 28.5 .14 3.76 5.82 117 358 Hov 33 0 5.99 9.27 180 552 Dec 23.5 0 4.15 6.42 128 394 0 alendar year 193 33 0 6.32 9.78 2,310 7,090 Jan 30 .40 6. 52 10.1 202 621 Feb- 18.6 .40 4.86 7.52 136 417 Mar 31.5 .84 11.1 17.2 343 1,050 Apr 34.5 .84 11.0 17.0 330 1,010 May 27 .61 8.59 13.3 266 817 Jim 27.5 .61 6.48 10.0 194 596 F Lscal year 1937-38 ...... 34.5 0 7.04 10.9 2,570 7,880 Partly estimated. ISLAND OF HAWAII

MISCELLANEOUS DISCHARGE MEASUREMENTS

Measurements of streams and ditches on the island of Hawaii at other than regular gaging stations are listed below: Miscellaneous discharge measurements on Hawaii during fiscal year July 1937 to June 1938 Discharge Second- Date Stream Tributary to Locality Million feet gallons a day Sept. 19 Kohala ditch. .... At upper end of new ditch lining 8.65 5.59 near Hiulil. 19 At lower end of new ditch lining 7.55 5.01 near Hlulll. Mar. 14 At Honokane weir near Nlulll. 45.2 29.2 May 19 Walakea flume . . . At divide below gaging station, 18.8 12.2 near Mountain View.

INDEX

Page Accuracy of data and computed results.. 2 Huelo, Halpuaena Stream near...... 85 Acre-foot, definition of...... 1 Honopou Stream near...... 100, 101, 102, 103 Agencies other than Geological Survey, Hoolawaliilll Stream near...... 98 records collected by...... 3-5 Hoolawamil Stream near...... 99 Alea, Pearl Harbor Springs near...... 44 Kaaiea Stream near...... 94 Alo Stream near Huelo...... 93 Kallua Stream near...... 97 Anahola ditch above Kaneha Reservoir, Koolau ditch near...... 88 near Kealla...... 27 Lowrie ditch near...... 108 wasteway of, near Kealla...... 28 Kanuel Luls ditch near...... 90 Anahola River near Kealla...... 26 Hailiilihaele Stream near...... 96 Awlnl ditch at East Honokanelkl Gulch, New Hamakua ditch near...... 105 near Hiulii...... Old Hamakua ditch near...... 106- 107 Oopuola Stream near...... 95 Computations, results of, accuracy of. Puohokamoa Stream near...... 89 Cooperation, record of...... Spreckels ditch near...... 87 , 91 Walkamol Stream near...... 92 Data, accuracy of. 2 Wailoa ditch near...... 104 explanation of.. 1-2 Ka Loko ditch near Kllauea...... 30 East Honokanelkl Intake to Awlnl ditch Kaaiea Stream near Huelo...... 94 at East Honokanelkl Gulch, near Kahaluu Stream near Heela...... 53 Hiulll...... 116 Kallua Stream near Huelo...... 97 East Kanoa ditch near Honolulu,...... 50 Kalalau Stream near Hanalel...... 36 East Wallualkl Stream near Keanae..,.., 78 Kalaupapa, Walkolu Stream near...... 61 East Walluanul Stream near Keanae...... 80 Kallhl Stream near Honolulu...... 46 Eleele, Hanapepe ditch near...... 13, 14 Kallhiwal ditch near Kllauea...... 32 Hanapepe River near...... 12 Kanaha ditch near Lihue...... 20 Kapaa, Kapaa River near...... 23 Haiku ditch at Kapalalaea Gulch, near Wailua ditch near...... 21 Huelo...... 109 Kapaa River at Kapahl ditch intake, Halpuaena diversion ditch at Kolea near Kapaa...... 23 Gulch, near Keanae...... 86 Kapahl ditch near Kealla...... 24 Halpuaena Stream near Huelo...... 85 Kapaula Stream below Government Road, Halawa Stream near Halawa...... 56 near Nahlku...... 72 Hanakaplal Stream near Hanalel...... 34 near Nahlku...... 71 Hanakoa Stream near Hanalel...... 35 Kapehu ditch near Hllo...... 114 Hanalel, Hanakaplal Stream near...... 34 Kauai, Island of, gaglng-station Hanakoa Stream near...... 35 records on...... Hanalel River near...... 33 Kaukonahua Stream, Horth Fork of, Left Kalalau Stream near...... 36 Branch of, near Wahlawa...... 38 Hanalel River at altitude 625 feet, Horth Fork of, Right Branch of, near near Hanalel...... 33 Wahlawa...... 37 Hanalei tunnel outlet near Lihue...... 17 Kawalkoi Stream near Waimea...... 7 Hanapepe ditch at Koula, near Eleele... 14 Kealla, Anahola ditch near...... 27 below intake, near Eleele...... 13 Anahola ditch wasteway near...... 28 Hanapepe River at Koula, near Eleele... 12 Anahola River near...... 26 Hanawl Stream below Government Road, Kapahl ditch near...... 24 near Hahiku...... 70 Lower Anahola ditch near...... 29 near Nahlku...... 69 Kakaleha ditch near...... 25 Hawaii, Island of, discharge measure­ Keanae, East Wallualkl Stream near,.... 78 ments on...... 119 East Walluanui Stream near...... 80 gaglng-station records on...... 110-118 Halpuaena diversion ditch near...... 86 Heeia, Kahaluu Stream near...... 53 Honomanu Stream near...... 84 Waihee Stream near...... 54 Koolau ditch near...... 83 Hllo, Hilo Boarding School ditch near.. 113 Taro patch feeder ditch at...... 82 Kapehu ditch near...... 114 West Koplliula Stream near...... 77 Wailuku River near...... 111, 112 West Wallualkl Stream near...... 79 Hilo Boarding School ditch at Intake, West Wailuanul Stream near...... 81 near Hllo...... 113 Kehena ditch near Kohala...... 118 Honokawal ditch near Lahaina...... 64 Kekaha dltoh at camp 1, near Waimea.... 11 Honokohau Stream near Honokohau...... 63 Kilauea, Ka Loko ditch near...... 30 Honolulu, East Branch of Kanoa Stream Kalihiwai ditch near...... 32 near...... 49 Puu Ka Ele ditch near...... 31 East Kanoa ditch near...... 50 Kipahulu, Oheo Stream near...... 66 Kallhl Stream near...... 46 Kohala, Kehena ditch near...... 118 Hoanalua Stream near...... 45 Kohala ditch at Pololu, near Hiulii.... 117 Nuuanu Stream near...... 47 Kokee ditch near Waimea...... Pukele Stream near...... 51 Koolau ditch at Haipuaena, near Huelo.. Walomao Stream near...... 52 at Hahiku weir, near Hahiku...... 73 West Branch of Kanoa Stream near..,.. 48 near Keanae...... 83 Honomanu Stream near Keanae...... 84 Honopou Stream above Halku ditch, near Lahaina, Honokawal ditch near...... 64 Huelo...... 102 Lanipuni Stream near Pelekunu...... 60 at Lowrie ditch siphon, near Huelo... 101 Lihue, East Branch of Horth Fork of below Halku ditch, near Huelo...... 103 Wallua River near...... 22 near Huelo...... 100 Hanalei tunnel outlet near...... 17 Hoolawaliilll Stream near Huelo...... 98 Kanaha ditch near...... 20 Hoolawamil Stream near Huelo...... 99 Horth Pork of Wailua River near...... 16 Huelo, Alo Stream near...... 93 Horth Wailua ditch near...... 18 Halku ditch near...... 109 South Fork of Wailua River near...... 15 121